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Level 18 - EAUEDTAQ
The answer to this puzzle is:
Words: EQUATED, EQUATE, AQUAE, QUATE, DEET, DAUT, AQUA, TAU, TED, ATE, ETA
Bonus words:
EQUATED, EQUATE, AQUAE, QUATE, DEET, DAUT, AQUA, TAU, TED, ATE, ETA