question: war:activity:weapon
choices.label: A B C D
choices.text: song:sing:music competition:broadcast:radio learning:process:books walk:exercise:cycling
explanation: "war" is an "activity" of armed struggle of a certain scale carried out by two opposing sides competing for certain political and economic purposes. "war" is an "activity", and "arms" are the necessary tools in a "war". the expressing forms of "songs" and "music" include "singing". "music" is a type of "song", and "music" is not a tool of "song". "radio" is not a tool for "competition". "learning" refers to the "process" of acquiring knowledge or skills through reading, listening, thinking, research, practice, etc. "learning" is one type of "porcess" and "books" are the necessary tools in "learning". "cycling" is not a tool for "walking".
relation: war activity R2.2
relation: war weapon R3.8
relation: learning process R2.2
relation: learning books R3.8