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All answers having "Amen!" as clue:

3 Character Answers:

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RHO

RON

YES



4 Character Answers:

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NAME

WORD

YEAH



5 Character Answers:

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RIGHT



6 Character Answers:

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AGREED

ANDHOW

IAGREE

ILLSAY

ITISSO

PREACH

SOBEIT

SOTRUE

VERILY



7 Character Answers:

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HOWTRUE

RIGHTON

YOUIDIT



8 Character Answers:

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IHEARYOU



9 Character Answers:

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YOUSAIDIT