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All answers having "Send" as clue:

3 Character Answers:

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FAX



4 Character Answers:

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BLOW

MAIL

SHIP

WIRE



5 Character Answers:

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ELATE

EMAIL

FEDEX

PINON

RADIO

REFER

REMIT

TELEX



6 Character Answers:

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TAPOUT

THRILL

WIRETO



7 Character Answers:

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MAILOUT

RELAYTO



8 Character Answers:

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TRANSMIT



10 Character Answers:

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EXHILARATE