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Level 9 - TNHEIC
The answer to this puzzle is:
Words: THEIN, THINE, CHINE, TENCH, ITCH, CHIT, CINE, CITE, ECHT, ETCH, ETIC, HENT, TINE, NITE, TIE, TIC, CHI, THE, NTH, NIT, HIE, ETC, HEN
Bonus words:
THEIN, THINE, CHINE, TENCH, ITCH, CHIT, CINE, CITE, ECHT, ETCH, ETIC, HENT, TINE, NITE, TIE, TIC, CHI, THE, NTH, NIT, HIE, ETC, HEN