WORDS STAY FIXED / MEANING MOVES

Where does
“not” belong?

Parentheses change what a statement means. Keep every word in place and group a span so the statement matches its intended meaning in every possible situation.

A = lantern lit · B = door open · C = bell ringing. Without parentheses, not binds first, then and, then or. The parser follows those rules exactly.

Group the fixed words

Every possible situation

Green rows agree. Copper rows are counterexamples: your statement and the intended meaning differ. True means the whole statement holds in that situation.

ABCIntendedYour meaning