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All answers having "Comprehended" as clue:

3 Character Answers:

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GOT

SEE



4 Character Answers:

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KNEW

SEEN



6 Character Answers:

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SENSED



7 Character Answers:

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GRASPED

TAKENIN



8 Character Answers:

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REALISED



10 Character Answers:

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UNDERSTOOD



13 Character Answers:

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GOTTHEPICTURE