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All answers having "So-so" as clue:

3 Character Answers:

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MEH



4 Character Answers:

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BLAH

FAIR

OKAY



5 Character Answers:

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HOHUM

TEPID



6 Character Answers:

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MEDIUM

NOTBAD



7 Character Answers:

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AVERAGE



8 Character Answers:

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MEDIOCRE

MIDDLING

MODERATE

NOTGREAT

NOTSOHOT

ORDINARY

PASSABLE



9 Character Answers:

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NOTTOOBAD

TOLERABLE



10 Character Answers:

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HALFDECENT



12 Character Answers:

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RUNOFTHEMILL

UNREMARKABLE



14 Character Answers:

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COMMECICOMMECA

POORTOMIDDLING



15 Character Answers:

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MIDDLEOFTHEROAD