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All answers having "Universal" as clue:

3 Character Answers:

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TAO



5 Character Answers:

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DONOR

TOTAL

TYPEO



6 Character Answers:

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COSMIC

GLOBAL

STUDIO



7 Character Answers:

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GENERAL



8 Character Answers:

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CATHOLIC

PANDEMIC



9 Character Answers:

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WORLDWIDE



10 Character Answers:

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ECUMENICAL