| enigma(noun, challenge, case, matter, knot) |
| hot water(noun, expression, challenge, case, matter) |
| side effect(noun, expression, development, conclusion, consequence) |
| side reaction(noun, expression, development, conclusion, consequence) |
| sticky wicket(noun, expression, challenge, case, matter) |
| afterclap(noun, development, conclusion, consequence, corollary) |
| aftereffect(noun, development, conclusion, consequence, corollary) |
| afterglow(noun, development, conclusion, consequence, corollary) |
| aftermath(noun, development, conclusion, consequence, corollary) |
| aftershock(noun, development, conclusion, consequence, corollary) |
| backwash(noun, development, conclusion, consequence, corollary) |
| blowback(noun, development, conclusion, consequence, corollary) |
| brainteaser(noun, challenge, case, matter, knot) |
| by-product(noun, development, conclusion, consequence, corollary) |
| case(noun, challenge, matter, knot) |
| catch(noun, challenge, case, matter, knot) |
| challenge(noun, case, matter, knot) |
| child(noun, development, conclusion, consequence, corollary) |
| conclusion(noun, development, consequence, corollary) |
| consequence(noun, development, conclusion, corollary) |