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Level 11 - AIYITVTC
The answer to this puzzle is:
Words: VIATIC, CATTY, VITTA, VATIC, TACIT, TITI, TACT, VITA, CAVY, VAT, TIC, TIT, ATT, TAT, VIA
Bonus words:
VIATIC, CATTY, VITTA, VATIC, TACIT, TITI, TACT, VITA, CAVY, VAT, TIC, TIT, ATT, TAT, VIA