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

Crossword clues for Soc. Sec. supplementer:

IRA: Soc. Sec. supplement
IRAS: Soc. Sec. supplements
IRA: Soc. Sec. supplementer
IRAS: Soc. Sec. supplements for many
IRAS: Some supplements to Soc. Sec.
IRA: Supplement to Soc. Sec.
IRA: Supplement to Soc. Sec., perhaps