Assertion: crossword's theme | /r/CapableOf | require breaking the symmetry rule
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: Rarely, puzzles with only vertical or horizontal symmetry can be found; yet rarer are asymmetrical puzzles, usually when an unusual theme requires breaking the symmetry rule.
text: Rarely, puzzles with only vertical or horizontal symmetry can be found; yet rarer are asymmetrical puzzles, usually when an unusual theme requires breaking the symmetry rule.