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

Crossword clues for First symptoms:

ONSET: First symptoms
ONSET: First symptoms, e.g.
RUNNYNOSE: Cold symptom (... first letter + the last 3 letters)
ONSET: First appearance, as of symptoms
ONSET: First occurrence, as of a symptom