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Level 21 - OSTENS
The answer to this puzzle is:
Words: ONSETS, STENOS, SETONS, NOSES, TONES, SONES, SNOTS, STENO, NESTS, SETON, TENS, SONS, SETS, TONS, ONES, NESS, NETS, EONS, SONE, SNOT, SENT, SOT, SEN, NOT, NOS, EON
Bonus words:
ONSETS, STENOS, SETONS, NOSES, TONES, SONES, SNOTS, STENO, NESTS, SETON, TENS, SONS, SETS, TONS, ONES, NESS, NETS, EONS, SONE, SNOT, SENT, SOT, SEN, NOT, NOS, EON