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Level 15 - IHAECVE
The answer to this puzzle is:
Words: CAVIE, CHIA, EAVE, ECHE, CHAI, HIE, VEE, CHI, VIE, AVE, VIA
Bonus words:
CAVIE, CHIA, EAVE, ECHE, CHAI, HIE, VEE, CHI, VIE, AVE, VIA