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

Crossword clues for Unspecified things:

ETCETERA: Unspecified things
ALLTHATJAZZ: Similar but unspecified things
ETC: Other things, unspecified: Abbr.
ETCETERA: Number of unspecified things
ETCETERAS: Additional unspecified things
ONES: Unspecified persons or things.