| how come(expression, idiom) |
| indeed |
| intention(noun, cause, purpose, basis, planned) |
| justification(noun, cause, start, reason, base) |
| perplexity(noun, difficulty, informal, question, secret) |
| pretext(noun, cause, reason, base, call) |
| question(difficulty, secret, puzzle, obscurity, knot) |
| what |
| why and wherefore(noun, expression, idiom, cause, start) |
| motive(noun, cause, reason, base, call) |
| occasion(noun, cause, start, reason, base) |
| according |
| account(noun, cause, reason, base, call) |
| call(noun, start, reason, basis, justification) |
| crux(difficulty, question, secret, puzzle, knot) |
| excuse(noun, cause, reason, base, call) |
| for which(expression, idiom) |
| goal(noun, cause, purpose, basis, planned) |
| grabber(noun, information, difficulty, reason, challenge) |
| marry(verb, affirmation) |