question: customs:inspection:tariff
choices.label: A B C D
choices.text: optical cable:communication:network speed filtration:purification:drinking forest:oxygen:health desert:camel:transport
explanation: "inspection" is the function of the "customs" which can impose "tariff". "communication" is the function of "optical cable", and "optical cable" can affect "network speed". "purification" is the purpose of "filtration" which does not improve "drinking" but water quality. "forest" corresponds to "oxygen", and there is no obvious logical relationship between "forest" and "health". "transportation" is the function of "camels".
relation: customs inspection R3.10
relation: inspection tariff R4.4
relation: optical cable communication R3.10
relation: communication network speed R4.4
relation: filtration purification R3.10
relation: forest oxygen R3.10