ultra-low particulate matter

ultra-low particulate matter, Total:196 items.

The international standard classification for "ultra-low particulate matter" includes: Hydraulic fluids , Occupational safety. Industrial hygiene , Non-metalliferous minerals , Protection against dangerous goods , Continuous handling equipment in general .

The Chinese standard classification for "ultra-low particulate matter" includes: Hydraulic fluid , Labor sanitation , Other non-metal mine product , Marking, packaging, transport and storage in general , Conveying machinery .

Group Standards of the People's Republic of China

T/XZFW 010-2023 Stationary source emission —data processor for monitoring of particulate matter at low concentration
T/CASME 77-2022 Laser particle sensor
T/XZFW 006-2023 Digital processor for monitoring results of low-concentration particulate matter in exhaust gas from fixed pollution sources
T/XZFW 004-2023 Determination of low-concentration particulate matter in exhaust gas from stationary pollution sources β-ray method
T/CSES 25-2021 Granular coal based activated carbon for ultra low emission of flue gas from iron and steel industry
T/QGCML 2175-2023 Biomass pellet smoker oven
T/CAMS CICEIA39-2020 Diesel engine particulate matter sensor
T/SDFIA 030-2021 Vegetable Protein Granules
T/NJ 1181-2019 Granular biomass hot air furnace

Henan Provincial Standard of the People's Republic of China

DB41/T 1431-2017 Particle Meter

Professional Standard - Electricity

DL/T 1915-2018 Technical specification for monitoring of particulate matter at low concentrations in the thermal power plants—Manual gravimetric method

未注明发布机构

CAN/CSA-ISO 17830:2017 Solid biofuels — Particle size distribution of disintegrated pellets
JIS Z 8899:2023 Particulate reference materials -- Specifications and uncertainty evaluation for polydisperse spherical particles
VDI 4300 Blatt 12-2021
VDI 2463 Blatt-3 E:2022-08 Particulate matter measurement – Determination of suspended particulate matter and gaseous chemical compounds in ambient air and indoor air – Active sampling via low-volume sampler (LVS)

Professional Standard - Construction Industry

JG/T 5089-1997 Determination of solid particulate contaminant in fluids by the automatic particle counting method

Hebei Provincial Standard of the People's Republic of China

DB13/T 2080-2014 Biomass Pellet Fuel Burner
DB13/T 2375-2016 Gravimetric method for determination of low-concentration particulate matter in exhaust gas from stationary pollution sources

Jiangxi Provincial Standard of the People's Republic of China

DB36/T 1386-2021 Determination of low-concentration particulate matter in exhaust gas from stationary pollution sources β-ray method

Professional Standard - Environmental Protection

HJ 2053-2018 Technical specifications for flue gas ultra-low emission engineering of coal-fired power plant

Professional Standard - Agriculture

15药典第三增补本-2010 A new variety of Siwu Granules
空气和废气监测分析方法 5.3.1-2003 Part Five Pollution Source Monitoring Chapter Three Determination of Particulate Matter and Metal Compounds Particle Matter

Inner Mongolia Provincial Standard of the People's Republic of China

DB15/T 2362-2021 Determination of low-concentration particulate matter in exhaust gas from stationary pollution sources β-ray method

Jilin Provincial Standard of the People's Republic of China

DB22/T 3426-2023 Determination of low-concentration particulate matter in exhaust gas from stationary pollution sources β-ray method

Qinghai Provincial Standard of the People's Republic of China

DB63/T 1873-2020 Determination of low-concentration particulate matter in exhaust gas from stationary pollution sources β-ray method

Shandong Provincial Standard of the People's Republic of China

DB37/T 2537-2014 Gravimetric method for determination of low-concentration particulate matter in exhaust gas from stationary pollution sources in Shandong Province
DB37/T 3785-2019 Determination of low-concentration particulate matter in exhaust gas from stationary pollution sources β-ray method

Liaoning Provincial Standard of the People's Republic of China

DB21/T 3270-2020 Determination of low-concentration particulate matter in exhaust gas from stationary pollution sources β-ray method
DB21/T 3049-2018 Corn cob pellets pet litter

Occupational Health Standard of the People's Republic of China

GBZ/T 192.6-2018 Determination of dust in the air of workplaces - Part 6: Total number concentration of ultrafine and fine particles

工业和信息化部

JC/T 2055-2020 Particle bentonite for pet litters

Professional Standard - Energy

NB/T 34026-2015 Biomass pellets burners

Professional Standard - Building Materials

JC/T 2055-2011 Particle Bentonite for Pet Litters

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

GB/T 6406-1996 Super abrasive -Grain sizes of diamond or cubic boron nitride
GB/T 22231-2008 Particle size distribution/fibre length and diameter distributions

Anhui Provincial Standard of the People's Republic of China

DB34/ 4811-2024 Construction site particle emission standards

未注明发布机构

VDI 4300 Blatt 12-2021
VDI 2463 Blatt-3 E:2022-08 Particulate matter measurement – Determination of suspended particulate matter and gaseous chemical compounds in ambient air and indoor air – Active sampling via low-volume sampler (LVS)
CAN/CSA-ISO 17830:2017 Solid biofuels — Particle size distribution of disintegrated pellets
JIS Z 8899:2023 Particulate reference materials -- Specifications and uncertainty evaluation for polydisperse spherical particles

Hubei Provincial Standard of the People's Republic of China

DB42/T 1904-2022 Portable β-ray method for the determination of low-concentration particulate matter in exhaust gas from stationary pollution sources

Professional Standard - Machinery

JB/T 9014.3-1999 Continuous handling equipment - Loose bulk material - Determination of composition of size and pellet

Institute of Environmental Sciences and Technology

IEST G-CC1002-1999 Determination of the Concentration of Airborne Ultrafine Particles

Japanese Industrial Standards Committee (JISC)

JIS H 7008:2002 Glossary of terms used in ultrafine metal particles
JIS T 8151:2005 Particulate respirators
JIS B 9930:1993 Hydraulic fluids -- Determination of particulate contamination by the particle count method
JIS Z 8890:2017 Particle characterization of particulate systems -- Vocabulary

PL-PKN

PN M59108-1985 Grains óf diamond, cubic boron nitride or composite - Granular composition

German Institute for Standardization

DIN 51813:1989 Determination of solid matter content of lubricating greases (particle sizes above 25 m)
DIN EN ISO 18847:2016-12 Solid biofuels - Determination of particle density of pellets and briquettes (ISO 18847:2016); German version EN ISO 18847:2016
DIN EN ISO 18847:2023-07 Solid biofuels - Determination of particle density of pellets and briquettes (ISO/DIS 18847:2023); German and English version prEN ISO 18847:2023 / Note: Date of issue 2023-05-26*Intended as replacement for DIN EN ISO 18847 (2016-12).
DIN EN ISO 17830:2023-02 Solid biofuels - Particle size distribution of disintegrated pellets (ISO/DIS 17830:2023); German and English version prEN ISO 17830:2023 / Note: Date of issue 2023-01-06*Intended as replacement for DIN EN ISO 17830 (2016-11).
DIN ISO 4387:2021-03 Cigarettes - Determination of total and nicotine-free dry particulate matter using a routine analytical smoking machine (ISO 4387:2019)

RO-ASRO

STAS 1753/2-1991 Abrasive material for abrasive bodies MICROPOWDERS Grains
STAS 8179/3-1975 LOW-DENSITY POLYETHYLENE GRANULESMethods of analysis
STAS 10813-1976 Air purity DETERMINATION OF PARTICULATE MATTER
STAS 8179/2-1975 Low-density polyethylene granules General technical reauirements for quality

SCC

AWWA ACE95103 The Use of Microfiltration/Ultrafiltration Processes for Particle Removal
VDI 3491 BLATT 11-1990 Measuring particles; producing test aerosols using ultrasonic atomizers
JIS T 8151:2018 Particulate respirators
DANSK DS/EN ISO 18847:2016 Solid biofuels – Determination of particle density of pellets and briquettes
VDI 3867 BLATT 6-2012 Measuring particles in the outside air — Determination of particle number concentration and number size distribution of aerosols — Electrical low pressure impactor (ELPI)
BS EN ISO 18847:2024 Solid biofuels. Determination of particle density of pellets and briquettes
VDI 3867 BLATT 6-2012 Measuring particles in the outside air — Determination of particle number concentration and number size distribution of aerosols — Electrical low pressure impactor (ELPI)
VDI 2463 BLATT 7-2014 Measuring particles — Detection of suspended dust and gaseous chemical compounds in outdoor and indoor air — Active sampling using low-volume samplers (LVS)
DANSK DS/EN 61788-9:2005 Superconductivity - Part 9: Measurements for bulk high temperature superconductors - Trapped flux density of large grain oxide superconductors
VDI 2463 BLATT 8-2014 Measuring particles — Detection of suspended dust in outdoor air and indoor air — Non-fractional sampling system for low-volume samplers (LVS)
CEI EN 61788-9:2005 Superconductivity - Part 9: Measurements for bulk high temperature superconductors - Trapped flux density of large grain oxide superconductors
AWWA MTC53889 Retrofit of Existing Granular Media Filters With Ultrafiltration Membrane
NS-EN ISO 18847:2016 Solid biofuels — Determination of particle density of pellets and briquettes (ISO 18847:2016)
VDI 2268 BLATT 3-1988 Determination of substances on particles; determination of thallium in emitted dust using atomic absorption spectrometry
CAN/CSA-ISO 18847-2021 Solid biofuels – Determination of particle density of pellets and briquettes (ISO 18847:2016, IDT)
AWWA WQTC55032 Retrofit of Existing Granular Media Filters With Ultrafiltration Membrane
DANSK DS/EN ISO 17830:2016 Solid biofuels – Particle size distrstørrelsebution of disintegrated pellets
CSA A123.1-M1979-1979 Asphalt Shingles Surfaced With Mineral Granules
AWWA WQTC62517 A Closer Look at Filter Effluent Particles Using Image-Based Particle Analysis
AWWA JAW26391 Journal AWWA — Assessing Hollow-Fiber Ultrafiltration for Particulate Removal
VDI 2463 BLATT 1-1999 Measuring particles — Gravimetric determination of the mass concentration of particles in the ambient air — Basics
AWWA JAW60847 Journal AWWA — Treatment Plant Design for Particulate Removal: Effects of Flow Rate and Particle Characteristics
AWWA ACE95102 Granular Media Filtration for Particle Removal
CAN/CSA-ISO 17831-1:2016 Solid biofuels — Determination of mechanical durability of pellets and briquettes — Part 1: Pellets
DANSK DS/EN 12457-1:2002 Characterisation of waste - Leaching - Compliance test for leaching of granular waste materials and sludges - Part 1: One stage batch test at a liquid to solid ratio of 2 l/kg for materials with high solid content and with particle size below 4 mm (wit...
AENOR UNE-EN 15210-1:2010 Solid biofuels. Determination of the mechanical durability of pellets and briquettes. Part 1: Pellets.
AS 2724.3:1984 Ambient air - Particulate matter - Part 3: Determination of total suspended particulates (TSP) - High volume sampler gravimetric method
AENOR UNE-EN 16126:2012 Solid biofuels. Determination of particle size distribution of disintegrated pellets.
VDI 3491 BLATT 11-1990 Measuring particles; producing test aerosols using ultrasonic atomizers
DANSK DS/ISO 4387:2019 Cigarettes – Determination of total and nicotine-free dry particulate matter using a routine analytical smoking machine
DANSK DS/EN ISO 17831-1:2016 Solid biofuels - Determination of mechanical durability of pellets and briquettes - Part 1: Pellets
NS-EN 15210-1:2009 Solid biofuels — Determination of mechanical durability of pellets and briquettes — Part 1: Pellets

SAE - SAE International

SAE ARP598A-1969 The Determination of Particulate Contamination in Liquids by the Particle Count Method
SAE ARP598B-1986 Determination of Particulate Contamination in Liquids by the Particle Count Method

British Standards Institution (BSI)

BS ISO 14411-2:2020 Preparation of particulate reference materials - Polydisperse spherical particles
19/30380724 DC Preparation of particulate reference materials — Part 2: Polydisperse spherical particles. Part 2. Polydisperse spherical particles
BS ISO 26824:2022 Particle characterization of particulate systems. Vocabulary

Association of German Mechanical Engineers

VDI 2463 Blatt 4-1976 Particulate matter measurement; Measurement of particulate matter in ambient air; LIB-filter method
VDI 3491 Blatt 1-1980 Particulate matter measurement; characteristics of suspended particulate matter in gases; terms and definitions

Society of Automotive Engineers (SAE)

SAE ARP598B-1991 THE DETERMINATION OF PARTICULATE CONTAMINATION IN LIQUIDS BY THE PARTICLE COUNT METHOD

KR-KS

KS M ISO 18847-2022 Solid biofuels — Determination of particle density of pellets and briquettes
KS M ISO 17830-2021 Solid biofuels — Particle size distribution of disintegrated pellets
KS I ISO 12141-2022 Stationary source emissions — Determination of mass concentration of particulate matter (dust) at low concentrations — Manual gravimetric method
KS M ISO 17831-1-2021 Solid biofuels — Determination of mechanical durability of pellets and briquettes — Part 1: Pellets

GSO

BH GSO ISO 18847:2022 Solid biofuels — Determination of particle density of pellets and briquettes
GSO ISO 18847:2021 Solid biofuels — Determination of particle density of pellets and briquettes
GSO IEC 61788-9:2021 Superconductivity - Part 9: Measurements for bulk high temperature superconductors - Trapped flux density of large grain oxide superconductors
BH GSO IEC 61788-9:2022 Superconductivity - Part 9: Measurements for bulk high temperature superconductors - Trapped flux density of large grain oxide superconductors
BH GSO ISO 17830:2022 Solid biofuels — Particle size distribution of disintegrated pellets
BH GSO ISO 26824:2017 Particle characterization of particulate systems -- Vocabulary
ISO 17830:2024 Solid biofuels — Particle size distribution of disintegrated pellets
GSO ISO 17830:2021 Solid biofuels — Particle size distribution of disintegrated pellets
OS GSO ISO 26824:2015 Particle characterization of particulate systems -- Vocabulary
BH GSO ISO 17831-1:2022 Solid biofuels — Determination of mechanical durability of pellets and briquettes — Part 1: Pellets
GSO ISO 17831-1:2021 Solid biofuels — Determination of mechanical durability of pellets and briquettes — Part 1: Pellets

Korean Agency for Technology and Standards (KATS)

KS B 6331-2022 The determination of particulate contamination in hydraulic fluids by the particle count method
KS M ISO 18847:2022 Solid biofuels — Determination of particle density of pellets and briquettes
KS C IEC 61788-9-2021 Superconductivity – Part 9: Measurements for bulk high temperature superconductors – Trapped flux density of large grain oxide superconductors
KS M ISO 17830:2021 Solid biofuels — Particle size distribution of disintegrated pellets
KS M 5434-1982 Test methods for coarse particle matter of pigments
KS M 5432-1984 Test methods for coarse particle matter of paint
KS I ISO 12141:2022 Stationary source emissions — Determination of mass concentration of particulate matter (dust) at low concentrations — Manual gravimetric method
KS I ISO 12141:2017 Stationary source emissions－Determination of mass concentration of particulate matter(dust) at low concentrations－Manual gravimetric method
KS L 6001-2002 Bonded abrasive grain sizes

International Organization for Standardization (ISO)

ISO/FDIS 18847:2023 Solid biofuels — Determination of particle density of pellets and briquettes
ISO 18847:2024 Solid biofuels — Determination of particle density of pellets and briquettes
ISO 14411-2:2020 Preparation of particulate reference materials — Part 2: Polydisperse spherical particles
ISO 26824:2022 Particle characterization of particulate systems — Vocabulary
ISO/FDIS 17830:2023 Solid biofuels — Particle size distribution of disintegrated pellets
ISO 5370:2023 Solid biofuels — Determination of fines content in pellets

ES-UNE

ISO/DIS 18847:2023 Solid biofuels — Determination of particle density of pellets and briquettes
UNE-EN 61788-9:2005 Superconductivity -- Part 9: Measurements for bulk high temperature superconductors - Trapped flux density of large grain oxide superconductors (Endorsed by AENOR in November of 2005.)
ISO/DIS 17830:2023 Solid biofuels — Particle size distribution of disintegrated pellets
UNE-EN ISO 17830:2016 Solid biofuels - Particle size distribution of disintegrated pellets (ISO 17830:2016)
UNE-EN ISO 17831-1:2016 Solid biofuels - Determination of mechanical durability of pellets and briquettes - Part 1: Pellets (ISO 17831-1:2015)

European Committee for Standardization (CEN)

prEN ISO 18847 rev Solid biofuels — Determination of particle density of pellets and briquettes
FprEN ISO 18847 Solid biofuels - Determination of particle density of pellets and briquettes (ISO/FDIS 18847:2024)
EN ISO 18847:2016 Solid biofuels - Determination of particle density of pellets and briquettes
EN ISO 5370:2023 Solid biofuels - Determination of fines content in pellets (ISO 5370:2023)

Association Francaise de Normalisation

NF X34-112*NF EN ISO 18847:2016 Solid biofuels - Determination of particle density of pellets and briquettes
NF EN 309:2005 Particleboard – Definitions and classification
FD ISO/TR 27628:2007 Air in workplaces - Ultrafine particles, nanoparticles and nanostructured aerosols - Characterization and assessment of exposure by inhalation
NF V37-001*NF ISO 4387:2020 Cigarettes - Determination of total and nicotine-free dry particulate matter using a routine analytical smoking machine
NF EN ISO 17831-1:2016 Solid biofuels - Determination of the mechanical resistance of pellets and briquettes - Part 1: pellets
NF EN ISO 17830:2016 Solid biofuels - Determination of the particle size distribution of disintegrated pellets
NF X34-114-1*NF EN ISO 17831-1:2016 Solid biofuels - Determination of mechanical durability of pellets and briquettes - Part 1 : pellets

VDI - Verein Deutscher Ingenieure

VDI 2463 Blatt 8-2012 Particulate matter measurement - Non-fractionating sampling system for suspended particulate matter in ambient air and indoor air for low-volume sampler (LVS)
VDI 3679 Blatt 1-1997 Nassabscheider fuer partikelfoermige Stoffe
VDI 2463 Blatt 7-2012 Particulate matter measurement - Sampling device for suspended particulate matter and gaseous chemical compounds in ambient air and indoor air - Active sampling via low-volume sampler (LVS)

American Society of Mechanical Engineers (ASME)

ASME PTC 21-1991 Particulate matter collection equipment
ASME PTC 28-1965(R1985) Determining the Properties of Fine Particulate Matter
ASME PTC 28-1965 Determining the properties of fine particulate matter
ASME PTC 38-1980(R1985) Determining the Concentration of Particulate Matter in A Gas Stream

U.S. Military Regulations and Norms

ARMY MIL-P-46994 B-1982 PELLETS/GRANULES BORON/POTASSIUM NITRATE
ARMY MIL-P-45486B-1974 PELLETS, RDX
ARMY MIL-P-45486 B NOTICE 2-2013 PELLETS, RDX
ARMY MIL-P-45486 B NOTICE 3-2013 PELLET, RDX
ARMY MIL-P-46464 A NOTICE 2-2013 PELLETS, TETRYL

United States Navy

NAVY QPL-32295-QPD-2011 Cleaner, Non-Aqueous, Low-Voc, Hap-Free

American Society for Testing and Materials (ASTM)

ASTM E2779-10(2017) Standard Test Method for Determining Particulate Matter Emissions from Pellet Heaters
ASTM D4536-96 Standard Test Method for High-Volume Sampling for Solid Particulate Matter and Determination of Particulate Emissions
ASTM E2779-10 Standard Test Method for Determining Particulate Matter Emissions from Pellet Heaters
ASTM D4791-19(2023) Standard Test Method for Flat Particles, Elongated Particles, or Flat and Elongated Particles in Coarse Aggregate
ASTM D4791-19 Standard Test Method for Flat Particles, Elongated Particles, or Flat and Elongated Particles in Coarse Aggregate
ASTM D4791-05 Standard Test Method for Flat Particles, Elongated Particles, or Flat and Elongated Particles in Coarse Aggregate
ASTM E1520-23 Standard Test Method for Particle Counts Per Pound of Granular Carriers and Dry-Applied Granular Formulations
ASTM D1888-78e1 Methods of Test for Particulate and Dissolved Matter in Water
ASTM D4791-10 Standard Test Method for Flat Particles, Elongated Particles, or Flat and Elongated Particles in Coarse Aggregate
ASTM D4791-05e1 Standard Test Method for Flat Particles, Elongated Particles, or Flat and Elongated Particles in Coarse Aggregate
ASTM D4791-99 Standard Test Method for Flat Particles, Elongated Particles, or Flat and Elongated Particles in Coarse Aggregate

Danish Standards Foundation

DS/EN 61788-9:2005 Superconductivity - Part 9: Measurements for bulk high temperature superconductors - Trapped flux density of large grain oxide superconductors
DS/ISO 4387:2000 Cigarettes - Determination of total and nicotine-free dry particulate matter using a routine analytical smoking machine
DS/ISO 4387/Amd. 1:2008 Cigarettes - Determination of total and nicotine-free dry particulate matter using a routine analytical smoking machine
DS/EN 16126:2012 Solid biofuels - Determination of particle size distribution of disintegrated pellets
DS/EN 15210-1:2010 Solid biofuels - Determination of mechanical durability of pellets and briquettes - Part 1: Pellets

ASHRAE - American Society of Heating@ Refrigerating and Air-Conditioning Engineers@ Inc.

ASHRAE OR-16-C025-2016 Characterizing the In-Situ Size-Resolved Removal Efficiency of Residential HVAC Filters for Fine and Ultrafine Particles

IN-BIS

IS 9024-1978 Specification for granular fertilizer mixtures
IS 9473-1980 Specification for filtering particulate respirators

AENOR

UNE-EN ISO 18847:2017 Solid biofuels - Determination of particle density of pellets and briquettes (ISO 18847:2016)
UNE-ISO 4387:2008 Cigarettes. Determination of total and nicotine-free dry particulate matter using a routine analytical smoking machine.
UNE-ISO 4387:2008/A1:2010 Cigarettes. Determination of total and nicotine-free dry particulate matter using a routine analytical smoking machine.

CL-INN

INDITECNOR 20-14ch-1960 Solid Combustibles: Particle Analysis

PT-IPQ

E 222-1968 Aggregate. Elastic particle content

CZ-CSN

CSN 42 9823-1989 Steel and Cast Iron Granules and Crushed Granules
CSN 46 1011-11-2003 Testing of cereals, pulses and oilseeds - Part 11: Testing of cereals - Determination of the rate of grains with reduced vitreousness of durum wheat (Triticum durum)

Lithuanian Standards Office

LST EN 61788-9-2005 Superconductivity. Part 9: Measurements for bulk high temperature superconductors. Trapped flux density of large grain oxide superconductors (IEC 61788-9:2005)
LST ISO 4387:2000 Cigarettes. Determination of total and nicotine-free dry particulate matter using a routine analytical smoking machine
LST EN 15210-1-2010 Solid biofuels - Determination of mechanical durability of pellets and briquettes - Part 1: Pellets

US-FCR

FCR UFGS-23 51 43.02 20-2006 ELECTROSTATIC DUST COLLECTOR OF FLUE GAS PARTICULATES

(U.S.) Ford Automotive Standards

FORD FLTM EU-BJ 053-01-2000 HYDRAULIC FLUID PARTICLE CONTAMINATION COUNT

Indonesia Standards

SNI 7543-2009 Animal feed pelletizer (pelletizer). Performance and test methods

API - American Petroleum Institute

API 922-1961 REMOVAL OF PARTICULATE MATTER FROM GASEOUS WASTES FILTRATION
API PUBL 4772-2008 Measuring Particulate Emissions from Combustion Sources

NATO - North Atlantic Treaty Organization

AFLP-3713-2014 DETERMINATION OF PARTICULATE MATTER IN AEROSPACE HYDRAULIC FLUIDS USING A PARTICLE ANALYSER (ED A@ Ver 1; To obtain please contact your national Defense Standardization Office or the NATO Standardization Office website: http:/ so.nato.int so@ Phone: +32 (

American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE)

ASHRAE EQUIP SI CH 28-2008 AIR CLEANERS FOR PARTICULATE CONTAMINANTS

RU-GOST R

GOST R 52381-2005 Abrasive materials. Grain and grain size distribution of grinding powders. Test of grain size distribution
GOST 21560.1-1982 Mineral fertilizers. Method for determination of grain-size analysis

HU-MSZT

MSZ 12792/2-1971 Particle Determination Inspection of Particle Drilling Materials

YU-JUS

JUS H.P1.501-1991 Pesticides.Granules and microqranules. Technical requirements

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