question: car:navigator
choices.label: A B C D
choices.text: computer:mouse camera:flash doctor:nurse office:desk
explanation: the "navigator" is a part of the "car", and the "navigator" has an indication function during use. "mouse" is a part of "computer", and "mouse" has an indication function during use. "flash" is a part of the "camera", and "flash" has no indication function during use. "doctor" and "nurse" are professions, "nurse" is not part of "doctor". "office" has "desk", and the "desk" has no indication function during use.
relation: car navigator R2.3
relation: computer mouse R2.3
relation: camera flash R2.3
relation: doctor nurse R2.4
relation: office desk R3.6