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: which unit of length is affiliated with a measurement system whose mass units include cental? 
Knowledge Triplets: Pound, measurement_unit.mass_unit.measurement_system, Avoirdupois
US customary units, measurement_unit.measurement_system.temperature_units, Degree Rankine
US customary units, measurement_unit.measurement_system.volume_units, Pint (US)
US customary units, measurement_unit.measurement_system.temperature_units, Degree Fahrenheit
united states customary system.noun.01, base.wordnet.synset.equivalent_topic, US customary units
mass.noun.01, base.wordnet.synset.equivalent_topic, Mass
Square yard, measurement_unit.area_unit.measurement_system, US customary units
Mass, measurement_unit.dimension.units, Troy pound
US customary units, user.movgp0.default_domain.measurement_system.unit_of_lenght, Foot
Mass, measurement_unit.dimension.units, Solar mass
avoirdupois unit.noun.01, base.wordnet.synset.broader_topic, Avoirdupois
US customary units, user.movgp0.default_domain.measurement_system.unit_of_volume, Quart (US)
Mass, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-0198
Mass, measurement_unit.dimension.units, Planck mass
micro per degree F, measurement_unit.inverse_temperature_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.weight_units, Pound
Peck (US), measurement_unit.volume_unit.measurement_system, US customary units
Pounds per square inch, measurement_unit.pressure_unit.measurement_system, US customary units
Fluid ounce (US), measurement_unit.volume_unit.measurement_system, US customary units
Kilopound-force per square inch, measurement_unit.pressure_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.volume_units, Quart (US dry)
US customary units, measurement_unit.measurement_system.volume_units, Gallon (US)
US customary units, measurement_unit.measurement_system.weight_units, Cental
Avoirdupois, measurement_unit.measurement_system.weight_units, Short quarter
US customary units, measurement_unit.measurement_system.volume_units, Fluid ounce (US)
US customary units, measurement_unit.measurement_system.area_units, US survey acre
Quart (US), measurement_unit.volume_unit.measurement_system, US customary units
Pint (US dry), measurement_unit.volume_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.volume_units, Gallon
Mass, measurement_unit.dimension.units, Mace
Short quarter, measurement_unit.mass_unit.measurement_system, Avoirdupois
Avoirdupois, measurement_unit.measurement_system.weight_units, Cental
US customary units, measurement_unit.measurement_system.luminance_units, Foot-lambert
Short ton, measurement_unit.mass_unit.measurement_system, Avoirdupois
Link, measurement_unit.distance_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.volume_units, Pint (US dry)
Mass, measurement_unit.dimension.units, Planetary mass
Grain, measurement_unit.mass_unit.measurement_system, US customary units
Mass, measurement_unit.dimension.si_base_unit, Kilogram
US customary units, measurement_unit.measurement_system.power_units, Mechanical horsepower
US customary units, measurement_unit.measurement_system.pressure_units, Pounds per square inch
Avoirdupois, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-ea7c
Cental, measurement_unit.mass_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.weight_units, Short ton
US customary units, measurement_unit.measurement_system.area_units, Section
Gallon, measurement_unit.volume_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.volume_units, Cubic mile
Dram, measurement_unit.mass_unit.measurement_system, Avoirdupois
Mile, measurement_unit.distance_unit.measurement_system, US customary units
Mass, measurement_unit.dimension.units, Milligram
US customary units, measurement_unit.measurement_system.volume_units, Gill
Mass, measurement_unit.dimension.units, Tonne
US customary units, measurement_unit.distance_unit.measurement_system, Foot
Short quarter, measurement_unit.mass_unit.measurement_system, US customary units
US customary units, user.movgp0.default_domain.measurement_system.unit_of_area, Square yard
Square foot, measurement_unit.area_unit.measurement_system, US customary units
Mass, measurement_unit.dimension.units, Candareen
Mass, measurement_unit.dimension.units, Short quarter
Ana Marie Cox, base.yupgrade.user.topics, Mass
Mass, measurement_unit.dimension.units, Dram
Cubic mile, measurement_unit.volume_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.specific_heat_capacity_units, Btu per pound-mass per degree F
Avoirdupois, base.schemastaging.context_name.pronunciation, g.125_lygc7
Cental, measurement_unit.mass_unit.weightmass_in_kilograms, 45.359237
US customary units, measurement_unit.measurement_system.volume_units, Fluid Dram US
Wired, base.yupgrade.user.topics, Mass
Degree Rankine, measurement_unit.temperature_unit.measurement_system, US customary units
Inch, measurement_unit.distance_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.area_units, Square yard
Foot-lambert, measurement_unit.luminance_unit.measurement_system, US customary units
Mass, base.schemastaging.context_name.pronunciation, g.125_l6gm1
US customary units, user.movgp0.default_domain.measurement_system.unit_of_temperature, Degree Rankine
Mass, measurement_unit.dimension.units, Long quarter
US customary units, user.movgp0.default_domain.measurement_system.unit_of_pressue, Pounds per square inch
Mass, measurement_unit.dimension.units, Picul
m.07nfbgl, base.ontologies.ontology_instance_mapping.freebase_topic, Mass
Short ton, measurement_unit.mass_unit.measurement_system, US customary units
Mass, measurement_unit.dimension.units, Hundredweight
Degree Fahrenheit, measurement_unit.temperature_unit.measurement_system, US customary units
Square mile, measurement_unit.area_unit.measurement_system, US customary units
Rod, measurement_unit.distance_unit.measurement_system, US customary units
Gallon (US), measurement_unit.volume_unit.measurement_system, US customary units
m.0qplrls, dataworld.gardening_hint.last_referenced_by, Mass
Mass, base.ontologies.ontology_instance.equivalent_instances, m.07nfbgl
US customary units, user.movgp0.default_domain.measurement_system.unit_of_speed, Miles per hour
Mass, measurement_unit.dimension.units, Atomic mass unit
US customary units, user.movgp0.default_domain.measurement_system.unit_of_lenght, Inch
Mass, measurement_unit.dimension.units, Catty
US customary units, user.movgp0.default_domain.measurement_system.unit_of_volume, Pint (US)
Mass, measurement_unit.dimension.units, Cental
Mass, measurement_unit.dimension.units, Long ton
US customary units, measurement_unit.measurement_system.weight_units, Grain
Ounce, measurement_unit.mass_unit.measurement_system, Avoirdupois
Mass, measurement_unit.dimension.units, Carat
Avoirdupois, measurement_unit.measurement_system.weight_units, Dram
US customary units, user.movgp0.default_domain.measurement_system.unit_of_power, Mechanical horsepower
US customary units, measurement_unit.measurement_system.length_units, Chain
Yard, measurement_unit.distance_unit.measurement_system, US customary units
Avoirdupois, measurement_unit.measurement_system.weight_units, Short ton
avoirdupois.noun.01, base.wordnet.synset.equivalent_topic, Avoirdupois
Mass, measurement_unit.dimension.units, Gram
US customary units, measurement_unit.measurement_system.length_units, Link
Avoirdupois, measurement_unit.measurement_system.weight_units, Ounce
US customary units, measurement_unit.distance_unit.measurement_system, Inch
US customary units, user.movgp0.default_domain.measurement_system.unit_of_area, Square mile
US customary units, measurement_unit.measurement_system.length_units, Yard
US customary units, measurement_unit.measurement_system.inverse_temperature_units, micro per degree F
US customary units, user.movgp0.default_domain.measurement_system.unit_of_volume, Gallon (US)
Fluid Dram US, measurement_unit.volume_unit.measurement_system, US customary units
Pound, measurement_unit.mass_unit.measurement_system, US customary units
m.075_7gq, base.yupgrade.user.topics, Mass
m.0qv1pxh, dataworld.gardening_hint.last_referenced_by, Avoirdupois
US customary units, measurement_unit.measurement_system.length_units, Inch
Avoirdupois, user.movgp0.default_domain.measurement_system.unit_of_mass, Short ton
Mass, measurement_unit.dimension.units, Jupiter mass
US customary units, measurement_unit.measurement_system.pressure_units, Kilopound-force per square inch
Mass (Physics), base.skosbase.skos_concept.equivalent_topic, Mass
US customary units, measurement_unit.measurement_system.volume_units, Bushel (US)
Gill, measurement_unit.volume_unit.measurement_system, US customary units
Bushel (US), measurement_unit.volume_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.area_units, Square mile
Mass, measurement_unit.dimension.units, Cash
US customary units, measurement_unit.distance_unit.measurement_system, Rod
US customary units, measurement_unit.measurement_system.volume_units, Quart (US)
m.0n5sspb, dataworld.gardening_hint.last_referenced_by, US customary units
US customary units, measurement_unit.measurement_system.volume_units, Cubic foot
Mass, measurement_unit.dimension.units, Troy ounce
US customary units, measurement_unit.measurement_system.weight_units, Short quarter
US customary units, measurement_unit.measurement_system.length_units, Mile
Mass, measurement_unit.dimension.units, Ounce
Mass, measurement_unit.dimension.units, Grain
US customary units, user.movgp0.default_domain.measurement_system.unit_of_temperature, Degree Fahrenheit
US customary units, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-aff7
Quart (US dry), measurement_unit.volume_unit.measurement_system, US customary units
US customary units, user.movgp0.default_domain.measurement_system.unit_of_mass, Pound
Mechanical horsepower, measurement_unit.power_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.volume_units, Peck (US)
Mass, measurement_unit.dimension.units, Kilogram
Mass, measurement_unit.dimension.units, Pound
US customary units, measurement_unit.measurement_system.speed_units, Miles per hour
Mass, base.skosbase.vocabulary_equivalent_topic.equivalent_concept, Mass (Physics)
Section, measurement_unit.area_unit.measurement_system, US customary units
Mass, measurement_unit.dimension.units, Microgram
Chain, measurement_unit.distance_unit.measurement_system, US customary units
Dram, measurement_unit.mass_unit.measurement_system, US customary units
Btu per pound-mass per degree F, measurement_unit.specific_heat_capacity_unit.measurement_system, US customary units
US customary units, user.movgp0.default_domain.measurement_system.unit_of_lenght, Yard
Mass, measurement_unit.dimension.units, Electron rest mass
US customary units, user.movgp0.default_domain.measurement_system.unit_of_area, Acre
Miles per hour, measurement_unit.speed_unit.measurement_system, US customary units
US customary units, user.movgp0.default_domain.measurement_system.unit_of_volume, Fluid ounce (US)
Foot, measurement_unit.distance_unit.measurement_system, US customary units
Avoirdupois, measurement_unit.measurement_system.weight_units, Pound
Mass, measurement_unit.dimension.units, Tael
US customary units, measurement_unit.measurement_system.weight_units, Ounce
US customary units, measurement_unit.measurement_system.length_units, Foot
US customary units, measurement_unit.measurement_system.area_units, Square foot
Ounce, measurement_unit.mass_unit.measurement_system, US customary units
Cubic foot, measurement_unit.volume_unit.measurement_system, US customary units
Avoirdupois, user.movgp0.default_domain.measurement_system.unit_of_mass, Ounce
US survey acre, measurement_unit.area_unit.measurement_system, US customary units
Mass, measurement_unit.dimension.units, Earth mass
Cental, measurement_unit.mass_unit.measurement_system, Avoirdupois
m.07vn7ph, base.yupgrade.user.topics, Mass
US customary units, measurement_unit.measurement_system.weight_units, Dram
Mass, measurement_unit.dimension.units, Short ton
Pint (US), measurement_unit.volume_unit.measurement_system, US customary units
Oil barrel, measurement_unit.volume_unit.measurement_system, US customary units
Mass, measurement_unit.dimension.units, Pennyweight
US customary units, measurement_unit.measurement_system.volume_units, Oil barrel
Mass, measurement_unit.dimension.units, MeV/c²
US customary units, measurement_unit.measurement_system.length_units, Rod
US customary units, user.movgp0.default_domain.measurement_system.unit_of_lenght, Mile
Mass, measurement_unit.dimension.units, Stone
united states liquid unit.noun.01, base.wordnet.synset.broader_topic, US customary units
Avoirdupois, user.movgp0.default_domain.measurement_system.unit_of_mass, Pound

Answer: Mile
Foot
Inch
Rod
Chain
Link
Yard