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Level 10 - STTREHC
The answer to this puzzle is:
Words: CHERTS, TECHS, RETCH, CHERT, TETHS, TRETS, SETT, RECS, HEST, ETHS, ERST, RESH, ECHT, HERS, SECT, TRES, ETC, HER, SEC, SER, REC, THE, RES
Bonus words:
CHERTS, TECHS, RETCH, CHERT, TETHS, TRETS, SETT, RECS, HEST, ETHS, ERST, RESH, ECHT, HERS, SECT, TRES, ETC, HER, SEC, SER, REC, THE, RES