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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Unhelpful mnemonic:

KASINKNAVE: Unhelpful mnemonic
PASINPSALM: Unhelpful mnemonic
CASINCZAR: Unhelpful mnemonic
GASINGNAT: Unhelpful mnemonic