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: what kind unit of length is associated with a measurement system whose mass units include catty? 
Knowledge Triplets: Mass, measurement_unit.dimension.units, Cash
Mass, base.skosbase.vocabulary_equivalent_topic.equivalent_concept, Mass (Physics)
catty.noun.01, base.wordnet.synset.equivalent_topic, Catty
Cun, measurement_unit.distance_unit.measurement_system, Chinese units of measurement
Mass, measurement_unit.dimension.units, Pennyweight
Mass, measurement_unit.dimension.units, Carat
Mass, measurement_unit.dimension.units, Grain
Candareen, measurement_unit.mass_unit.measurement_system, Chinese units of measurement
Mass, measurement_unit.dimension.units, Jupiter mass
m.07r8prz, base.wordnet.word_sense.sense, catty.noun.01
Picul, measurement_unit.mass_unit.measurement_system, Chinese units of measurement
m.0qplrls, dataworld.gardening_hint.last_referenced_by, Mass
Wired, base.yupgrade.user.topics, Mass
Mass, measurement_unit.dimension.units, Picul
Mass, measurement_unit.dimension.units, Planetary mass
Mass, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-0198
Ana Marie Cox, base.yupgrade.user.topics, Mass
Mass, measurement_unit.dimension.units, Earth mass
Mass, measurement_unit.dimension.units, Atomic mass unit
Mass, base.schemastaging.context_name.pronunciation, g.125_l6gm1
Mass, measurement_unit.dimension.units, Troy ounce
Mass, measurement_unit.dimension.units, Planck mass
Mass, measurement_unit.dimension.units, Mace
Chinese units of measurement, measurement_unit.measurement_system.weight_units, Picul
Mass, measurement_unit.dimension.units, Gram
Mass, measurement_unit.dimension.units, MeV/c²
Mass, measurement_unit.dimension.units, Candareen
g.125_qdx34, base.schemastaging.pronunciation.yomigana, きん
catty.noun.01, base.wordnet.synset.word, m.07r8prz
Catty, base.schemastaging.context_name.pronunciation, g.125_qdx34
Mass, measurement_unit.dimension.si_base_unit, Kilogram
m.07nfbgl, base.ontologies.ontology_instance_mapping.freebase_topic, Mass
Mass, measurement_unit.dimension.units, Stone
Mass, measurement_unit.dimension.units, Short ton
Mass, measurement_unit.dimension.units, Ounce
Chinese units of measurement, measurement_unit.measurement_system.weight_units, Tael
Mass, measurement_unit.dimension.units, Long ton
Mass, measurement_unit.dimension.units, Tonne
m.07r8psc, base.wordnet.word_sense.sense, catty.noun.01
Mass (Physics), base.skosbase.skos_concept.equivalent_topic, Mass
Mass, measurement_unit.dimension.units, Catty
Mass, measurement_unit.dimension.units, Long quarter
weight unit.noun.02, base.wordnet.synset.hyponymy, catty.noun.01
Mass, measurement_unit.dimension.units, Hundredweight
noun.quantity, base.wordnet.lexical_name.synsets, catty.noun.01
Mass, base.ontologies.ontology_instance.equivalent_instances, m.07nfbgl
Chinese units of measurement, measurement_unit.measurement_system.weight_units, Catty
Li, measurement_unit.distance_unit.measurement_system, Chinese units of measurement
Chinese units of measurement, measurement_unit.distance_unit.measurement_system, Cun
catty.noun.01, base.wordnet.synset.hypernym, weight unit.noun.02
Chinese units of measurement, user.movgp0.default_domain.measurement_system.unit_of_lenght, Li
catty.noun.01, base.wordnet.synset.syntactic_category, Noun
Mass, measurement_unit.dimension.units, Pound
Mass, measurement_unit.dimension.units, Short quarter
Mass, measurement_unit.dimension.units, Dram
catty.noun.01, base.wordnet.synset.gloss, any of various units of weight used in southeastern Asia (especially a Chinese measure equal to 500 grams)
Mass, measurement_unit.dimension.units, Tael
Chinese units of measurement, measurement_unit.measurement_system.weight_units, Mace
Chinese units of measurement, measurement_unit.measurement_system.weight_units, Cash
m.075_7gq, base.yupgrade.user.topics, Mass
Catty, measurement_unit.mass_unit.measurement_system, Chinese units of measurement
m.07vn7ph, base.yupgrade.user.topics, Mass
Chinese units of measurement, measurement_unit.measurement_system.weight_units, Candareen
Mass, measurement_unit.dimension.units, Milligram
Cash, measurement_unit.mass_unit.measurement_system, Chinese units of measurement
Mass, measurement_unit.dimension.units, Electron rest mass
catty.noun.01, base.wordnet.synset.word, m.07r8psc
Chinese units of measurement, measurement_unit.measurement_system.length_units, Cun
catty.noun.01, base.wordnet.synset.lexname, noun.quantity
Mace, measurement_unit.mass_unit.measurement_system, Chinese units of measurement
Mass, measurement_unit.dimension.units, Kilogram
Mass, measurement_unit.dimension.units, Microgram
Catty, measurement_unit.mass_unit.weightmass_in_kilograms, 0.60478982
Chinese units of measurement, measurement_unit.measurement_system.length_units, Li
Mass, measurement_unit.dimension.units, Troy pound
Mass, measurement_unit.dimension.units, Cental
Catty, measurement_unit.measurement_system.weight_units, Chinese units of measurement
Mass, measurement_unit.dimension.units, Solar mass
mass.noun.01, base.wordnet.synset.equivalent_topic, Mass
Tael, measurement_unit.mass_unit.measurement_system, Chinese units of measurement

Answer: Cun
Li