The answer for "sta4nce" appears to be a play on words or a puzzle. If we replace the "4" with "t," it could represent the word "stance." If this is a specific reference to a context, please provide more details for a precise answer.
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You have "4" in "stance", so it's "for instance".
sta4nce
Usually the first two and the last two letters are blue, making it "once in a blue moon"