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 system of measurement includes gill as a unit of volume? 
Knowledge Triplets: Bushel (US), measurement_unit.volume_unit.measurement_system, US customary units
Fluid Dram US, measurement_unit.volume_unit.measurement_system, US customary units
US customary units, user.movgp0.default_domain.measurement_system.unit_of_speed, Miles per hour
Cubic foot, measurement_unit.volume_unit.measurement_system, US customary units
Mile, measurement_unit.distance_unit.measurement_system, US customary units
Degree Fahrenheit, measurement_unit.temperature_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, Bushel (US)
united states liquid unit.noun.01, base.wordnet.synset.broader_topic, US customary units
Inch, measurement_unit.distance_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.volume_units, Cubic foot
US customary units, measurement_unit.measurement_system.length_units, Mile
US customary units, user.movgp0.default_domain.measurement_system.unit_of_area, Acre
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_lenght, Yard
Foot, measurement_unit.distance_unit.measurement_system, US customary units
US customary units, user.movgp0.default_domain.measurement_system.unit_of_volume, Pint (US)
US customary units, measurement_unit.measurement_system.weight_units, Pound
Quart (US dry), measurement_unit.volume_unit.measurement_system, US customary units
Quart (US), measurement_unit.volume_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.area_units, Square mile
US customary units, measurement_unit.measurement_system.volume_units, Quart (US dry)
US customary units, measurement_unit.measurement_system.volume_units, Quart (US)
Miles per hour, measurement_unit.speed_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.volume_units, Pint (US)
Gill, measurement_unit.volume_unit.volume_in_cubic_meters, 0.0001182941
Pint (US), measurement_unit.volume_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.speed_units, Miles per hour
Fluid ounce (US), measurement_unit.volume_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.temperature_units, Degree Rankine
US customary units, measurement_unit.measurement_system.area_units, US survey acre
US customary units, measurement_unit.measurement_system.inverse_temperature_units, micro per degree F
Short ton, measurement_unit.mass_unit.measurement_system, US customary units
Oil barrel, measurement_unit.volume_unit.measurement_system, US customary units
Square mile, measurement_unit.area_unit.measurement_system, US customary units
Foot-lambert, measurement_unit.luminance_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.volume_units, Gallon (US)
US customary units, user.movgp0.default_domain.measurement_system.unit_of_lenght, Foot
US customary units, measurement_unit.measurement_system.power_units, Mechanical horsepower
US customary units, user.movgp0.default_domain.measurement_system.unit_of_pressue, Pounds per square inch
US customary units, user.movgp0.default_domain.measurement_system.unit_of_area, Square mile
US customary units, measurement_unit.measurement_system.pressure_units, Kilopound-force per square inch
US customary units, measurement_unit.measurement_system.weight_units, Short ton
US customary units, measurement_unit.measurement_system.specific_heat_capacity_units, Btu per pound-mass per degree F
Square foot, measurement_unit.area_unit.measurement_system, US customary units
Gill, measurement_unit.volume_unit.measurement_system, US customary units
Yard, measurement_unit.distance_unit.measurement_system, US customary units
US survey acre, measurement_unit.area_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.area_units, Square foot
Degree Rankine, measurement_unit.temperature_unit.measurement_system, US customary units
m.0n5sspb, dataworld.gardening_hint.last_referenced_by, US customary units
united states customary system.noun.01, base.wordnet.synset.equivalent_topic, US customary units
micro per degree F, measurement_unit.inverse_temperature_unit.measurement_system, US customary units
Section, measurement_unit.area_unit.measurement_system, US customary units
US customary units, user.movgp0.default_domain.measurement_system.unit_of_volume, Gallon (US)
Link, measurement_unit.distance_unit.measurement_system, US customary units
Rod, measurement_unit.distance_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.volume_units, Pint (US dry)
US customary units, measurement_unit.measurement_system.length_units, Foot
US customary units, measurement_unit.measurement_system.volume_units, Gallon
US customary units, measurement_unit.measurement_system.area_units, Section
US customary units, measurement_unit.measurement_system.temperature_units, Degree Fahrenheit
US customary units, user.movgp0.default_domain.measurement_system.unit_of_lenght, Inch
US customary units, user.movgp0.default_domain.measurement_system.unit_of_mass, Pound
Grain, measurement_unit.mass_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.weight_units, Grain
US customary units, measurement_unit.measurement_system.weight_units, Short quarter
US customary units, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-aff7
Dram, measurement_unit.mass_unit.measurement_system, US customary units
Pint (US dry), measurement_unit.volume_unit.measurement_system, US customary units
US customary units, user.movgp0.default_domain.measurement_system.unit_of_lenght, Mile
Cental, measurement_unit.mass_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.volume_units, Fluid ounce (US)
Square yard, measurement_unit.area_unit.measurement_system, US customary units
Ounce, measurement_unit.mass_unit.measurement_system, US customary units
US customary units, user.movgp0.default_domain.measurement_system.unit_of_temperature, Degree Fahrenheit
Mechanical horsepower, measurement_unit.power_unit.measurement_system, US customary units
Pounds per square inch, measurement_unit.pressure_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.volume_units, Peck (US)
US customary units, measurement_unit.measurement_system.length_units, Chain
Chain, measurement_unit.distance_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.volume_units, Cubic mile
US customary units, user.movgp0.default_domain.measurement_system.unit_of_temperature, Degree Rankine
Pound, measurement_unit.mass_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.weight_units, Ounce
Gallon, measurement_unit.volume_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.volume_units, Gill
US customary units, user.movgp0.default_domain.measurement_system.unit_of_power, Mechanical horsepower
Btu per pound-mass per degree F, measurement_unit.specific_heat_capacity_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.length_units, Yard
US customary units, measurement_unit.measurement_system.volume_units, Oil barrel
Short quarter, measurement_unit.mass_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.luminance_units, Foot-lambert
Gill, measurement_unit.measurement_system.volume_units, US customary units
US customary units, measurement_unit.measurement_system.pressure_units, Pounds per square inch
US customary units, user.movgp0.default_domain.measurement_system.unit_of_volume, Fluid ounce (US)
Gallon (US), measurement_unit.volume_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.length_units, Link
US customary units, measurement_unit.measurement_system.length_units, Inch
US customary units, measurement_unit.measurement_system.weight_units, Cental
US customary units, measurement_unit.measurement_system.length_units, Rod
Cubic mile, measurement_unit.volume_unit.measurement_system, US customary units
US customary units, user.movgp0.default_domain.measurement_system.unit_of_area, Square yard
US customary units, measurement_unit.measurement_system.volume_units, Fluid Dram US
Peck (US), measurement_unit.volume_unit.measurement_system, US customary units
US customary units, measurement_unit.measurement_system.weight_units, Dram
US customary units, measurement_unit.measurement_system.area_units, Square yard

Answer: US customary units