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All answers having "Roger that" as clue:

4 Character Answers:

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COPY

ISEE



5 Character Answers:

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CHECK

GOTIT



6 Character Answers:

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GOTCHA



7 Character Answers:

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GOT{IT}

IGOTCHA



8 Character Answers:

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IHEARYOU

IREADYOU



9 Character Answers:

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TEN{FOUR}