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Level 17 - NEIHTC
The answer to this puzzle is:
Words: THEIN, TENCH, CHINE, THINE, ITCH, CHIT, CINE, CITE, ECHT, ETCH, ETIC, HENT, TINE, NITE, TIC, CHI, THE, NTH, NIT, HIE, ETC, HIT
Bonus words:
THEIN, TENCH, CHINE, THINE, ITCH, CHIT, CINE, CITE, ECHT, ETCH, ETIC, HENT, TINE, NITE, TIC, CHI, THE, NTH, NIT, HIE, ETC, HIT