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All answers having "Friendly greeting" as clue:

3 Character Answers:

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DAP

HUG



5 Character Answers:

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ALOHA

SMILE



7 Character Answers:

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HITHERE

WELCOME



8 Character Answers:

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HEYTHERE



9 Character Answers:

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CHEEKKISS



12 Character Answers:

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NICETOSEEYOU