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Level 20 - ITTEIAIN
The answer to this puzzle is:
Words: TITIAN, ENTIA, TINEA, TENIA, NETT, INIA, INTI, ETNA, TITI, TAIN, TEAT, NITE, TATE, ANTE, TINE, TINT, ETA, TAT, ANI, NIT, ATT, TIT, ATE
Bonus words:
TITIAN, ENTIA, TINEA, TENIA, NETT, INIA, INTI, ETNA, TITI, TAIN, TEAT, NITE, TATE, ANTE, TINE, TINT, ETA, TAT, ANI, NIT, ATT, TIT, ATE