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All answers having "___ level" as clue:

3 Character Answers:

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SEA



4 Character Answers:

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EVEN

FLAT

RASE

RAZE

RUNG

SHIM

STEP

TIER

TRUE



5 Character Answers:

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ENTRY

EQUAL

LAYER

PLANE

PLUMB

SPLIT

STORY



6 Character Answers:

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EVENED

FLTTEN

HONEST

PLANAR

SMOOTH

THREAT



7 Character Answers:

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DESTROY

ECHELON

FLATTEN

ONALINE

STRATUM



8 Character Answers:

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BULLDOZE

TEARDOWN



11 Character Answers:

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NECKANDNECK



14 Character Answers:

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LAYITONTHELINE

TELLITLIKEITIS



15 Character Answers:

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RAZETOTHEGROUND