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 units of length are associated with the system where mass is measured in grains? 
Knowledge Triplets: US customary units, user.movgp0.default_domain.measurement_system.unit_of_volume, Fluid ounce (US)
Cable length, measurement_unit.distance_unit.measurement_system, Imperial unit system
Long quarter, measurement_unit.mass_unit.measurement_system, Imperial unit system
US customary units, user.movgp0.default_domain.measurement_system.unit_of_power, Mechanical horsepower
Imperial unit system, measurement_unit.measurement_system.length_units, Yard
Imperial unit system, measurement_unit.measurement_system.weight_units, Grain
Rod, measurement_unit.distance_unit.measurement_system, Imperial unit system
Imperial unit system, measurement_unit.measurement_system.length_units, Cable length
US customary units, measurement_unit.distance_unit.measurement_system, Inch
Pound, measurement_unit.mass_unit.measurement_system, US customary units
Imperial unit system, measurement_unit.measurement_system.weight_units, Hundredweight
m.07p_x5h, base.wordnet.word_sense.sense, grain.noun.04
Oil barrel, measurement_unit.volume_unit.measurement_system, US customary units
Gill, measurement_unit.volume_unit.measurement_system, US customary units
Mass, measurement_unit.dimension.units, Picul
Grain, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0081-6245
Fluid Dram US, measurement_unit.volume_unit.measurement_system, US customary units
grain.noun.04, base.wordnet.synset.word, m.07p_x5h
Gallon (Imperial), measurement_unit.volume_unit.measurement_system, Imperial unit system
Mechanical horsepower, measurement_unit.power_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.volume_units, Pint (US dry)
Fluid ounce (imperial), measurement_unit.volume_unit.measurement_system, Imperial unit system
Imperial unit system, measurement_unit.measurement_system.length_units, Chain
Mass, measurement_unit.dimension.units, Planetary mass
Cubic foot, measurement_unit.volume_unit.measurement_system, Imperial unit system
Imperial unit system, measurement_unit.measurement_system.weight_units, Stone
Kilopound-force per square inch, measurement_unit.pressure_unit.measurement_system, US customary units
Acre, measurement_unit.area_unit.measurement_system, Imperial unit system
Mass, measurement_unit.dimension.units, Long quarter
Cental, measurement_unit.mass_unit.measurement_system, US customary units
Link, measurement_unit.distance_unit.measurement_system, Imperial unit system
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
Furlong, measurement_unit.distance_unit.measurement_system, Imperial unit system
grain.noun.05, base.wordnet.synset.hypernym, apothecaries' unit.noun.01
Mass, measurement_unit.dimension.units, Dram
noun.attribute, base.wordnet.lexical_name.synsets, grain.noun.09
US customary units, user.movgp0.default_domain.measurement_system.unit_of_lenght, Yard
US customary units, measurement_unit.measurement_system.volume_units, Quart (US)
m.07p_x52, base.wordnet.word_sense.sense, grain.noun.04
US customary units, user.movgp0.default_domain.measurement_system.unit_of_volume, Pint (US)
Imperial unit system, measurement_unit.measurement_system.volume_units, Cubic foot
Mass, measurement_unit.dimension.units, Short ton
Imperial unit system, measurement_unit.measurement_system.volume_units, Quart (Imperial)
grain.noun.04, base.wordnet.synset.gloss, a weight unit used for pearls or diamonds: 50 mg or 1/4 carat
decigram.noun.01, base.wordnet.synset.part_meronym, grain.noun.04
Chain, measurement_unit.distance_unit.measurement_system, Imperial unit system
Imperial unit system, user.movgp0.default_domain.measurement_system.unit_of_mass, Stone
Degree Rankine, measurement_unit.temperature_unit.measurement_system, US customary units
Imperial unit system, user.movgp0.default_domain.measurement_system.unit_of_volume, Pint (Imperial)
Mass, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-0198
Square yard, measurement_unit.area_unit.measurement_system, Imperial unit system
Mass, measurement_unit.dimension.units, Cash
Imperial unit system, measurement_unit.measurement_system.volume_units, Cup (Imperial)
Imperial unit system, measurement_unit.measurement_system.volume_units, Tablespoon
US customary units, user.movgp0.default_domain.measurement_system.unit_of_lenght, Mile
Mass, measurement_unit.dimension.units, Gram
Imperial unit system, measurement_unit.measurement_system.length_units, Rod
Imperial unit system, measurement_unit.measurement_system.length_units, Nautical mile
Imperial unit system, user.movgp0.default_domain.measurement_system.unit_of_area, Acre
US customary units, user.movgp0.default_domain.measurement_system.unit_of_area, Square yard
Pint (Imperial), measurement_unit.volume_unit.measurement_system, Imperial unit system
US customary units, measurement_unit.measurement_system.volume_units, Oil barrel
grain.noun.01, base.wordnet.synset.syntactic_category, Noun
Mass, measurement_unit.dimension.units, Tonne
Mass, measurement_unit.dimension.units, Tael
US customary units, measurement_unit.measurement_system.volume_units, Gallon
US customary units, measurement_unit.measurement_system.inverse_temperature_units, micro per degree F
Imperial unit system, measurement_unit.measurement_system.area_units, Square mile
grain.noun.09, base.wordnet.synset.equivalent_topic, Grain
Degree Fahrenheit, measurement_unit.temperature_unit.measurement_system, US customary units
Mass, measurement_unit.dimension.units, Microgram
grain.noun.04, base.wordnet.synset.hypernym, metric weight unit.noun.01
Short quarter, measurement_unit.mass_unit.measurement_system, US customary units
Imperial unit system, measurement_unit.measurement_system.weight_units, Long ton
US customary units, measurement_unit.measurement_system.pressure_units, Pounds per square inch
US customary units, measurement_unit.measurement_system.area_units, Square mile
Pint (US dry), measurement_unit.volume_unit.measurement_system, US customary units
Imperial unit system, measurement_unit.measurement_system.volume_units, Gill (Imperial)
US customary units, measurement_unit.measurement_system.specific_heat_capacity_units, Btu per pound-mass per degree F
Hundredweight, measurement_unit.mass_unit.measurement_system, Imperial unit system
US customary units, measurement_unit.measurement_system.area_units, Square foot
US customary units, measurement_unit.measurement_system.volume_units, Bushel (US)
Long ton, measurement_unit.mass_unit.measurement_system, Imperial unit system
Imperial unit system, measurement_unit.measurement_system.force_units, Poundal
Tablespoon, measurement_unit.volume_unit.measurement_system, Imperial unit system
Imperial unit system, user.movgp0.default_domain.measurement_system.unit_of_mass, Long ton
US customary units, user.movgp0.default_domain.measurement_system.unit_of_volume, Gallon (US)
Imperial unit system, measurement_unit.measurement_system.length_units, Foot
Mass, measurement_unit.dimension.units, Troy ounce
scruple.noun.01, base.wordnet.synset.part_meronym, grain.noun.05
grain.noun.09, base.wordnet.synset.lexname, noun.attribute
Pound, measurement_unit.mass_unit.measurement_system, Imperial unit system
Mass, base.skosbase.vocabulary_equivalent_topic.equivalent_concept, Mass (Physics)
Grain, measurement_unit.mass_unit.measurement_system, Imperial unit system
US customary units, measurement_unit.measurement_system.volume_units, Quart (US dry)
Mass, measurement_unit.dimension.units, Pennyweight
Gallon, measurement_unit.volume_unit.measurement_system, US customary units
Imperial unit system, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-5e30
Troy weight, measurement_unit.measurement_system.weight_units, Troy ounce
Cup (Imperial), measurement_unit.volume_unit.measurement_system, Imperial unit system
Pint (US), measurement_unit.volume_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.pressure_units, Kilopound-force per square inch
Bushel (Imperial), measurement_unit.volume_unit.measurement_system, Imperial unit system
US customary units, measurement_unit.measurement_system.area_units, US survey acre
Chain, measurement_unit.distance_unit.measurement_system, US customary units
grain.noun.09, base.wordnet.synset.hypernym, smallness.noun.01
US customary units, user.movgp0.default_domain.measurement_system.unit_of_lenght, Inch
Imperial unit system, measurement_unit.measurement_system.weight_units, Long quarter
US customary units, measurement_unit.measurement_system.volume_units, Gallon (US)
Mass (Physics), base.skosbase.skos_concept.equivalent_topic, Mass
Imperial unit system, measurement_unit.measurement_system.volume_units, Bushel (Imperial)
US customary units, user.movgp0.default_domain.measurement_system.unit_of_volume, Quart (US)
Imperial unit system, measurement_unit.measurement_system.volume_units, Fluid ounce (imperial)
micro per degree F, measurement_unit.inverse_temperature_unit.measurement_system, US customary units
Foot, measurement_unit.distance_unit.measurement_system, US customary units
troy.noun.01, base.wordnet.synset.equivalent_topic, Troy weight
US customary units, measurement_unit.measurement_system.weight_units, Short quarter
Imperial unit system, measurement_unit.distance_unit.measurement_system, League
Mass, measurement_unit.dimension.units, Pound
apothecaries' unit.noun.01, base.wordnet.synset.hyponymy, grain.noun.05
Imperial unit system, measurement_unit.measurement_system.weight_units, Ounce
Mass, base.schemastaging.context_name.pronunciation, g.125_l6gm1
grain.noun.05, base.wordnet.synset.equivalent_topic, Grain
US customary units, measurement_unit.measurement_system.volume_units, Fluid Dram US
Troy weight, measurement_unit.measurement_system.weight_units, Pennyweight
Imperial unit system, user.movgp0.default_domain.measurement_system.unit_of_volume, Fluid ounce (imperial)
Square yard, measurement_unit.area_unit.measurement_system, US customary units
US customary units, user.movgp0.default_domain.measurement_system.unit_of_area, Square mile
US customary units, measurement_unit.measurement_system.temperature_units, Degree Fahrenheit
troy unit.noun.01, base.wordnet.synset.hyponymy, grain.noun.05
Imperial unit system, measurement_unit.measurement_system.length_units, Mile
Imperial unit system, measurement_unit.measurement_system.volume_units, Gallon (Imperial)
US customary units, measurement_unit.measurement_system.volume_units, Gill
Cubic mile, measurement_unit.volume_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.volume_units, Pint (US)
US customary units, user.movgp0.default_domain.measurement_system.unit_of_area, Acre
US customary units, measurement_unit.measurement_system.length_units, Link
Dram, measurement_unit.mass_unit.measurement_system, Imperial unit system
Imperial unit system, measurement_unit.measurement_system.length_units, League
US customary units, measurement_unit.measurement_system.luminance_units, Foot-lambert
Inch, measurement_unit.distance_unit.measurement_system, Imperial unit system
Troy weight, measurement_unit.measurement_system.weight_units, Troy pound
US customary units, measurement_unit.measurement_system.length_units, Chain
Peck (US), measurement_unit.volume_unit.measurement_system, US customary units
Imperial unit system, user.movgp0.default_domain.measurement_system.unit_of_lenght, Mile
Ounce, measurement_unit.mass_unit.measurement_system, US customary units
noun.quantity, base.wordnet.lexical_name.synsets, grain.noun.04
Imperial unit system, user.movgp0.default_domain.measurement_system.unit_of_mass, Ounce
US customary units, measurement_unit.measurement_system.weight_units, Pound
Foot, measurement_unit.distance_unit.measurement_system, Imperial unit system
US customary units, measurement_unit.measurement_system.area_units, Section
Imperial unit system, user.movgp0.default_domain.measurement_system.unit_of_volume, Gallon (Imperial)
US customary units, measurement_unit.measurement_system.volume_units, Cubic foot
smallness.noun.01, base.wordnet.synset.hyponymy, grain.noun.09
US customary units, measurement_unit.measurement_system.weight_units, Cental
US customary units, measurement_unit.measurement_system.weight_units, Grain
Square mile, measurement_unit.area_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.speed_units, Miles per hour
US customary units, measurement_unit.measurement_system.length_units, Foot
US customary units, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-aff7
US customary units, measurement_unit.measurement_system.power_units, Mechanical horsepower
US customary units, measurement_unit.measurement_system.length_units, Yard
Mass, measurement_unit.dimension.units, Catty
grain.noun.01, base.wordnet.synset.word, m.07snjz8
Imperial unit system, measurement_unit.measurement_system.area_units, Square foot
Fathom, measurement_unit.distance_unit.measurement_system, Imperial unit system
US customary units, measurement_unit.measurement_system.length_units, Mile
Miles per hour, measurement_unit.speed_unit.measurement_system, US customary units
US customary units, user.movgp0.default_domain.measurement_system.unit_of_lenght, Foot
Thousandth of an inch, measurement_unit.distance_unit.measurement_system, Imperial unit system
Imperial unit system, measurement_unit.measurement_system.volume_units, Peck (Imperial)
Yard, measurement_unit.distance_unit.measurement_system, Imperial unit system
Mass, measurement_unit.dimension.units, Ounce
Link, measurement_unit.distance_unit.measurement_system, US customary units
pennyweight.noun.01, base.wordnet.synset.part_meronym, grain.noun.05
Gill (Imperial), measurement_unit.volume_unit.measurement_system, Imperial unit system
US customary units, measurement_unit.measurement_system.weight_units, Ounce
metric weight unit.noun.01, base.wordnet.synset.hyponymy, grain.noun.04
grain.noun.04, base.wordnet.synset.part_meronym, milligram.noun.01
Imperial unit system, user.movgp0.default_domain.measurement_system.unit_of_lenght, Inch
Imperial unit system, measurement_unit.measurement_system.weight_units, Dram
Btu per pound-mass per degree F, measurement_unit.specific_heat_capacity_unit.measurement_system, US customary units
Imperial unit system, user.movgp0.default_domain.measurement_system.unit_of_mass, Pound
Mass, measurement_unit.dimension.units, Solar mass
Section, measurement_unit.area_unit.measurement_system, US customary units
Imperial unit system, measurement_unit.measurement_system.length_units, Furlong
Stone, measurement_unit.mass_unit.measurement_system, Imperial unit system
mass.noun.01, base.wordnet.synset.equivalent_topic, Mass
Mile, measurement_unit.distance_unit.measurement_system, Imperial unit system
Mass, measurement_unit.dimension.units, Milligram
m.0n5sspb, dataworld.gardening_hint.last_referenced_by, US customary units
US customary units, measurement_unit.measurement_system.length_units, Rod
Troy weight, measurement_unit.measurement_system.weight_units, Grain
Square mile, measurement_unit.area_unit.measurement_system, Imperial unit system
Mass, measurement_unit.dimension.units, Long ton
grain.noun.04, base.wordnet.synset.equivalent_topic, Grain
grain.noun.05, base.wordnet.synset.lexname, noun.quantity
grain.noun.01, base.wordnet.synset.hyponymy, granule.noun.01
Short ton, measurement_unit.mass_unit.measurement_system, US customary units
grain.noun.01, base.wordnet.synset.lexname, noun.object
US customary units, user.movgp0.default_domain.measurement_system.unit_of_pressue, Pounds per square inch
Imperial unit system, measurement_unit.measurement_system.length_units, Inch
grain.noun.04, base.wordnet.synset.part_holonym, decigram.noun.01
grain.noun.04, base.wordnet.synset.word, m.07p_x52
Mile, measurement_unit.distance_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.weight_units, Dram
Quart (US dry), measurement_unit.volume_unit.measurement_system, US customary units
m.07snjz8, base.wordnet.word_sense.sense, grain.noun.01
milligram.noun.01, base.wordnet.synset.part_holonym, grain.noun.04
grain.noun.04, base.wordnet.synset.syntactic_category, Noun
Dram, measurement_unit.mass_unit.measurement_system, US customary units
grain.noun.05, base.wordnet.synset.part_holonym, pennyweight.noun.01
Ounce, measurement_unit.mass_unit.measurement_system, Imperial unit system
Mass, measurement_unit.dimension.units, MeV/c²
Mass, measurement_unit.dimension.units, Mace
Troy weight, symbols.namesake.named_after, Troyes
US customary units, measurement_unit.distance_unit.measurement_system, Rod
m.07rw1n0, base.wordnet.word_sense.sense, grain.noun.05
Cubic foot, measurement_unit.volume_unit.measurement_system, US customary units
Pennyweight, measurement_unit.mass_unit.measurement_system, Troy weight
US customary units, measurement_unit.measurement_system.volume_units, Fluid ounce (US)
US customary units, measurement_unit.measurement_system.weight_units, Short ton
Bushel (US), measurement_unit.volume_unit.measurement_system, US customary units
Mass, base.ontologies.ontology_instance.equivalent_instances, m.07nfbgl
Degree Fahrenheit, measurement_unit.temperature_unit.measurement_system, Imperial unit system
united states customary system.noun.01, base.wordnet.synset.equivalent_topic, US customary units
grain.noun.05, base.wordnet.synset.syntactic_category, Noun
US customary units, measurement_unit.distance_unit.measurement_system, Foot
US customary units, measurement_unit.measurement_system.volume_units, Peck (US)
Mass, measurement_unit.dimension.units, Stone
Troyes, symbols.name_source.namesakes, Troy weight
Mass, measurement_unit.dimension.units, Atomic mass unit
grain.noun.01, base.wordnet.synset.equivalent_topic, Grain
m.075_7gq, base.yupgrade.user.topics, Mass
US customary units, user.movgp0.default_domain.measurement_system.unit_of_mass, Pound
Square foot, measurement_unit.area_unit.measurement_system, US customary units
Imperial unit system, measurement_unit.measurement_system.area_units, Acre
Mass, measurement_unit.dimension.units, Carat
Mass, measurement_unit.dimension.si_base_unit, Kilogram
noun.quantity, base.wordnet.lexical_name.synsets, grain.noun.05
League, measurement_unit.distance_unit.measurement_system, Imperial unit system
grain.noun.05, base.wordnet.synset.hypernym, troy unit.noun.01
Grain, measurement_unit.mass_unit.measurement_system, US customary units
Imperial unit system, measurement_unit.distance_unit.measurement_system, Thousandth of an inch
Mass, measurement_unit.dimension.units, Hundredweight
Troy pound, measurement_unit.mass_unit.measurement_system, Troy weight
Mass, measurement_unit.dimension.units, Candareen
m.0qplrls, dataworld.gardening_hint.last_referenced_by, Mass
Nautical mile, measurement_unit.distance_unit.measurement_system, Imperial unit system
Foot-lambert, measurement_unit.luminance_unit.measurement_system, US customary units
noun.object, base.wordnet.lexical_name.synsets, grain.noun.01
Square foot, measurement_unit.area_unit.measurement_system, Imperial unit system
Wired, base.yupgrade.user.topics, Mass
grain.noun.05, base.wordnet.synset.part_holonym, scruple.noun.01
Imperial unit system, user.movgp0.default_domain.measurement_system.unit_of_lenght, Yard
Imperial unit system, measurement_unit.measurement_system.length_units, Thousandth of an inch
grain.noun.05, base.wordnet.synset.gloss, 1/60 dram; equals an avoirdupois grain or 64.799 milligrams
Gallon (US), measurement_unit.volume_unit.measurement_system, US customary units
Rod, measurement_unit.distance_unit.measurement_system, US customary units
Imperial unit system, measurement_unit.measurement_system.weight_units, Pound
Mass, measurement_unit.dimension.units, Kilogram
US customary units, measurement_unit.measurement_system.area_units, Square yard
m.07qgxcf, base.wordnet.word_sense.sense, grain.noun.09
Imperial unit system, measurement_unit.measurement_system.volume_units, Pint (Imperial)
Troy ounce, measurement_unit.mass_unit.measurement_system, Troy weight
Grain, measurement_unit.mass_unit.measurement_system, Troy weight
Ana Marie Cox, base.yupgrade.user.topics, Mass
british imperial system.noun.01, base.wordnet.synset.equivalent_topic, Imperial unit system
Yard, measurement_unit.distance_unit.measurement_system, US customary units
Mass, measurement_unit.dimension.units, Troy pound
Imperial unit system, user.movgp0.default_domain.measurement_system.unit_of_lenght, Foot
grain.noun.01, base.wordnet.synset.hypernym, atom.noun.02
US customary units, measurement_unit.measurement_system.length_units, Inch
Imperial unit system, user.movgp0.default_domain.measurement_system.unit_of_area, Square yard
US survey acre, measurement_unit.area_unit.measurement_system, US customary units
Mass, measurement_unit.dimension.units, Jupiter mass
Mass, measurement_unit.dimension.units, Cental
atom.noun.02, base.wordnet.synset.hyponymy, grain.noun.01
grain.noun.09, base.wordnet.synset.word, m.07qgxcf
Poundal, measurement_unit.unit_of_force.measurement_system, Imperial unit system
US customary units, user.movgp0.default_domain.measurement_system.unit_of_temperature, Degree Fahrenheit
Mass, measurement_unit.dimension.units, Earth mass
Inch, measurement_unit.distance_unit.measurement_system, US customary units
Imperial unit system, measurement_unit.measurement_system.temperature_units, Degree Fahrenheit
Quart (US), measurement_unit.volume_unit.measurement_system, US customary units
grain.noun.04, base.wordnet.synset.lexname, noun.quantity
US customary units, measurement_unit.measurement_system.temperature_units, Degree Rankine
US customary units, user.movgp0.default_domain.measurement_system.unit_of_speed, Miles per hour
Mass, measurement_unit.dimension.units, Short quarter
US customary units, user.movgp0.default_domain.measurement_system.unit_of_temperature, Degree Rankine
Imperial unit system, measurement_unit.measurement_system.area_units, Square yard
Mass, measurement_unit.dimension.units, Electron rest mass
m.07vn7ph, base.yupgrade.user.topics, Mass
granule.noun.01, base.wordnet.synset.hypernym, grain.noun.01
Mass, measurement_unit.dimension.units, Planck mass
US customary units, measurement_unit.measurement_system.volume_units, Cubic mile
Peck (Imperial), measurement_unit.volume_unit.measurement_system, Imperial unit system
m.07nfbgl, base.ontologies.ontology_instance_mapping.freebase_topic, Mass
united states liquid unit.noun.01, base.wordnet.synset.broader_topic, US customary units
Mass, measurement_unit.dimension.units, Grain
Grain, measurement_unit.mass_unit.weightmass_in_kilograms, 6.479891e-05
grain.noun.09, base.wordnet.synset.syntactic_category, Noun
grain.noun.05, base.wordnet.synset.word, m.07rw1n0
grain.noun.01, base.wordnet.synset.gloss, a relatively small granular particle of a substance; "a grain of sand"; "a grain of sugar"
Quart (Imperial), measurement_unit.volume_unit.measurement_system, Imperial unit system
Imperial unit system, measurement_unit.measurement_system.length_units, Link
Imperial unit system, measurement_unit.measurement_system.length_units, Fathom
m.0hn7rgm, dataworld.gardening_hint.last_referenced_by, Imperial unit system

Answer: Mile
Foot
Inch
Fathom
Rod
Chain
Cable length
Nautical mile
Link
Yard
Furlong
League
Thousandth of an inch