Answer: OPTSIN

Possible questions:


Chooses to participate we know 1 Answer
Doesn't decline we know 3 Answers
Decides to participate we know 1 Answer
Decides to join we know 1 Answer
Chooses to take part we know 1 Answer
Chooses to join we know 1 Answer
Chooses to get e-mail, maybe we know 1 Answer

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