user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: the pressure units of pounds per square inch can be measured using what type of system ? 
Knowledge Triplets: Pressure, measurement_unit.dimension.si_base_unit, Pascal
m.075_72n, base.yupgrade.user.topics, Pressure
US customary units, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-aff7
pressure unit.noun.01, base.wordnet.synset.equivalent_topic, Pressure
US customary units, user.movgp0.default_domain.measurement_system.unit_of_volume, Pint (US)
US customary units, user.movgp0.default_domain.measurement_system.unit_of_temperature, Degree Fahrenheit
US customary units, measurement_unit.measurement_system.weight_units, Dram
Pound, measurement_unit.mass_unit.measurement_system, US customary units
m.0tmwcs_, dataworld.gardening_hint.last_referenced_by, m.0tct220
Oil barrel, measurement_unit.volume_unit.measurement_system, US customary units
Intermediate Pressure, type.property.expected_type, Integer
Mile, measurement_unit.distance_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.inverse_temperature_units, micro per degree F
Gill, measurement_unit.volume_unit.measurement_system, US customary units
Short quarter, measurement_unit.mass_unit.measurement_system, US customary units
US customary units, user.movgp0.default_domain.measurement_system.unit_of_speed, Miles per hour
Btu per pound-mass per degree F, measurement_unit.specific_heat_capacity_unit.measurement_system, US customary units
Scuba Tank, type.type.properties, Service Pressure
US customary units, measurement_unit.measurement_system.volume_units, Peck (US)
Pressure, base.ontologies.ontology_instance.equivalent_instances, m.07nfhwr
m.040b101, type.permission.controls, Service Pressure
Floating Point Number, type.type.expected_by, Service Pressure
Inch, measurement_unit.distance_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.luminance_units, Foot-lambert
US customary units, measurement_unit.measurement_system.pressure_units, Kilopound-force per square inch
US customary units, measurement_unit.measurement_system.volume_units, Bushel (US)
Pressure, measurement_unit.dimension.units, Decibars
US customary units, user.movgp0.default_domain.measurement_system.unit_of_area, Square yard
US customary units, measurement_unit.measurement_system.volume_units, Cubic foot
pounds per square inch.noun.01, base.wordnet.synset.word, m.07szl6q
Pressure, measurement_unit.dimension.units, Inch of mercury
Intermediate Pressure, type.object.permission, m.040b101
US customary units, measurement_unit.measurement_system.length_units, Rod
US customary units, measurement_unit.measurement_system.length_units, Mile
US customary units, user.movgp0.default_domain.measurement_system.unit_of_area, Square mile
Pressure, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-fe72
Fluid ounce (US), measurement_unit.volume_unit.measurement_system, US customary units
pounds per square inch.noun.01, base.wordnet.synset.syntactic_category, Noun
micro per degree F, measurement_unit.inverse_temperature_unit.measurement_system, US customary units
m.0t7dyxc, dataworld.gardening_hint.last_referenced_by, m.0qtb8dl
Pressure, base.skosbase.vocabulary_equivalent_topic.broader_concept, Force and energy
Gallon (US), measurement_unit.volume_unit.measurement_system, US customary units
Pressure, measurement_unit.dimension.units, Technical atmosphere
US customary units, measurement_unit.measurement_system.volume_units, Gill
Pressure, medicine.disease_cause.diseases, Pressure ulcer
m.07nfhwr, base.ontologies.ontology_instance_mapping.freebase_topic, Pressure
US customary units, measurement_unit.measurement_system.power_units, Mechanical horsepower
Square mile, measurement_unit.area_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.length_units, Link
US customary units, measurement_unit.measurement_system.volume_units, Quart (US)
Fluid Dram US, measurement_unit.volume_unit.measurement_system, US customary units
Cubic mile, measurement_unit.volume_unit.measurement_system, US customary units
US customary units, user.movgp0.default_domain.measurement_system.unit_of_lenght, Foot
US customary units, user.movgp0.default_domain.measurement_system.unit_of_volume, Quart (US)
US customary units, user.movgp0.default_domain.measurement_system.unit_of_temperature, Degree Rankine
united states customary system.noun.01, base.wordnet.synset.equivalent_topic, US customary units
Pressure, measurement_unit.dimension.units, Centimetre of water
Pressure, measurement_unit.dimension.units, Torr
Intermediate Pressure, type.property.schema, First Stage Regulator
Miles per hour, measurement_unit.speed_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.area_units, Section
m.07szl73, base.wordnet.word_sense.sense, pounds per square inch.noun.01
Chain, measurement_unit.distance_unit.measurement_system, US customary units
Kilopound-force per square inch, measurement_unit.pressure_unit.measurement_system, US customary units
US customary units, user.movgp0.default_domain.measurement_system.unit_of_lenght, Yard
Pounds per square inch, measurement_unit.pressure_unit.measurement_system, US customary units
Intermediate Pressure, type.property.unit, Pounds per square inch
g.125_pcvh0, base.schemastaging.pronunciation.yomigana, じゅうりょうポンドまいへいほうインチ
US customary units, measurement_unit.measurement_system.weight_units, Pound
US customary units, measurement_unit.measurement_system.weight_units, Grain
Bushel (US), measurement_unit.volume_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.length_units, Foot
US customary units, user.movgp0.default_domain.measurement_system.unit_of_lenght, Mile
pounds per square inch.noun.01, base.wordnet.synset.hypernym, pressure unit.noun.01
Quart (US), measurement_unit.volume_unit.measurement_system, US customary units
Service Pressure, type.property.expected_type, Floating Point Number
US customary units, user.movgp0.default_domain.measurement_system.unit_of_area, Acre
pressure.noun.01, base.wordnet.synset.equivalent_topic, Pressure
Yard, measurement_unit.distance_unit.measurement_system, US customary units
m.0tct220, dataworld.gardening_hint.last_referenced_by, Pounds per square inch
US customary units, measurement_unit.measurement_system.volume_units, Pint (US dry)
US customary units, measurement_unit.measurement_system.area_units, Square foot
Cubic foot, measurement_unit.volume_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.temperature_units, Degree Rankine
pounds per square inch.noun.01, base.wordnet.synset.lexname, noun.quantity
Pressure, measurement_unit.dimension.units, Atmosphere
US customary units, measurement_unit.measurement_system.length_units, Inch
pounds per square inch.noun.01, base.wordnet.synset.equivalent_topic, Pounds per square inch
Peck (US), measurement_unit.volume_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.speed_units, Miles per hour
François Arago, user.lindenb.default_domain.scientist.known_for, Pressure
First Stage Regulator, type.type.properties, Intermediate Pressure
Service Pressure, type.object.permission, m.040b101
Pressure, measurement_unit.dimension.units, KiloNewton per metre squared
US customary units, user.movgp0.default_domain.measurement_system.unit_of_power, Mechanical horsepower
Degree Fahrenheit, measurement_unit.temperature_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.temperature_units, Degree Fahrenheit
Pint (US), measurement_unit.volume_unit.measurement_system, US customary units
US customary units, user.movgp0.default_domain.measurement_system.unit_of_lenght, Inch
US customary units, measurement_unit.measurement_system.volume_units, Quart (US dry)
US customary units, measurement_unit.measurement_system.volume_units, Cubic mile
US customary units, user.movgp0.default_domain.measurement_system.unit_of_mass, Pound
m.07szl6q, base.wordnet.word_sense.sense, pounds per square inch.noun.01
US customary units, measurement_unit.measurement_system.volume_units, Fluid ounce (US)
US customary units, user.movgp0.default_domain.measurement_system.unit_of_volume, Fluid ounce (US)
US customary units, measurement_unit.measurement_system.specific_heat_capacity_units, Btu per pound-mass per degree F
US survey acre, measurement_unit.area_unit.measurement_system, US customary units
m.019h, type.permission.controls, m.0qtb8dl
Section, measurement_unit.area_unit.measurement_system, US customary units
m.0qtb8dl, type.object.permission, m.019h
Force and energy, base.skosbase.skos_concept.narrower_topic, Pressure
US customary units, measurement_unit.measurement_system.volume_units, Fluid Dram US
m.0qtb8dl, dataworld.gardening_hint.last_referenced_by, Pounds per square inch
Foot, measurement_unit.distance_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.volume_units, Pint (US)
Link, measurement_unit.distance_unit.measurement_system, US customary units
Pressure, measurement_unit.dimension.units, Millibar
US customary units, measurement_unit.measurement_system.area_units, Square mile
Mechanical horsepower, measurement_unit.power_unit.measurement_system, US customary units
US customary units, user.movgp0.default_domain.measurement_system.unit_of_volume, Gallon (US)
Pressure, base.schemastaging.context_name.pronunciation, g.125_s3xp2
Short ton, measurement_unit.mass_unit.measurement_system, US customary units
US customary units, user.movgp0.default_domain.measurement_system.unit_of_pressue, Pounds per square inch
Pressure ulcer, medicine.disease.causes, Pressure
pounds per square inch.noun.01, base.wordnet.synset.word, m.07szl73
m.019h, type.permission.controls, m.0tct220
Service Pressure, type.property.schema, Scuba Tank
US customary units, measurement_unit.measurement_system.area_units, Square yard
Dram, measurement_unit.mass_unit.measurement_system, US customary units
Pressure, measurement_unit.dimension.units, Kilogram-force per square centimetre
US customary units, measurement_unit.measurement_system.weight_units, Ounce
pounds per square inch.noun.01, base.wordnet.synset.gloss, a unit of pressure
Pressure, measurement_unit.dimension.units, Kilopascal
Pressure, measurement_unit.dimension.units, Gigapascal
US customary units, measurement_unit.measurement_system.pressure_units, Pounds per square inch
Pounds per square inch, user.avh.default_domain.ellerdale_topic.ellerdale_id, 00d8-e1f9
Foot-lambert, measurement_unit.luminance_unit.measurement_system, US customary units
Degree Rankine, measurement_unit.temperature_unit.measurement_system, US customary units
Service Pressure, type.property.unit, Pounds per square inch
Pressure, measurement_unit.dimension.units, Bar
m.0tct220, type.object.permission, m.019h
Pounds per square inch, base.schemastaging.context_name.pronunciation, g.125_pcvh0
Rod, measurement_unit.distance_unit.measurement_system, US customary units
Pressure, measurement_unit.dimension.units, Megapascal
Cental, measurement_unit.mass_unit.measurement_system, US customary units
Pressure, measurement_unit.dimension.units, Kilopound-force per square inch
m.0n5sspb, dataworld.gardening_hint.last_referenced_by, US customary units
noun.quantity, base.wordnet.lexical_name.synsets, pounds per square inch.noun.01
pressure unit.noun.01, base.wordnet.synset.hyponymy, pounds per square inch.noun.01
Pressure, measurement_unit.dimension.units, Pièze
Pint (US dry), measurement_unit.volume_unit.measurement_system, US customary units
Quart (US dry), measurement_unit.volume_unit.measurement_system, US customary units
Pressure, measurement_unit.dimension.units, Pascal
US customary units, measurement_unit.measurement_system.volume_units, Gallon (US)
US customary units, measurement_unit.measurement_system.weight_units, Short ton
united states liquid unit.noun.01, base.wordnet.synset.broader_topic, US customary units
m.0v8c53n, dataworld.gardening_hint.last_referenced_by, Pressure
US customary units, measurement_unit.measurement_system.length_units, Yard
US customary units, measurement_unit.measurement_system.volume_units, Gallon
Square yard, measurement_unit.area_unit.measurement_system, US customary units
Service Pressure, type.property.unique, true
Grain, measurement_unit.mass_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.volume_units, Oil barrel
US customary units, measurement_unit.measurement_system.area_units, US survey acre
Ounce, measurement_unit.mass_unit.measurement_system, US customary units
Integer, type.type.expected_by, Intermediate Pressure
Pressure, measurement_unit.dimension.units, Pounds per square inch
US customary units, measurement_unit.measurement_system.weight_units, Cental
Gallon, measurement_unit.volume_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.weight_units, Short quarter
Pounds per square inch, measurement_unit.pressure_unit.pressure_in_pascals, 6894.75729
US customary units, measurement_unit.measurement_system.length_units, Chain
Square foot, measurement_unit.area_unit.measurement_system, US customary units
Pressure, measurement_unit.dimension.units, Barye
m.040b101, type.permission.controls, Intermediate Pressure

Answer: US customary units