question: coptis:bitter
choices.label: A B C D
choices.text: flowers:bright red diamond:hard city:prosperity class:unity
explanation: the taste of "coptis" is "bitter". the color of a "flower" is not necessarily "bright red", and "flowers" have many colors, and "bright red" is a probable attribute of a "flower". "diamond" refers to polished diamond, and diamond is the most "hard" substance that exists in nature. "diamond" must have "hardness". "city" is not necessarily "prosperous", it may also be depressed. "prosperity" is a probable attribute of a "city". "class" is not necessarily "unity", and may not be "unity". "unity" is a probable attribute of "class".
relation: flowers bright red R3.2
relation: diamond hard R3.1
relation: city prosperity R3.2
relation: class unity R3.2