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Level 15 - IEETSTAH
The answer to this puzzle is:
Words: STAITHE, ATHEIST, THEIST, TITHES, SAITHE, THETAS, TESTAE, HEATS, TITHE, TESTA, TEATS, SETAE, TETHS, HAETS, TATES, SAITH, THETA, HIST, SETT, SETA, ATES, TATS, SITH, SATE, SITE, EAST, TEST, HEST, THAT, SEAT, AHIS, TITS, SHIT, HAET, AITS, EATH, HAES, ETAS, ETHS, SHEA, TEAT, TEES, HATS, THEE, TIES, EATS, STAT, HAST, TEAS, TATE, THAI, HITS, TEE, HAT, SET, SIT, THE, HIT, TEA, SAT, TIE, SEE, ATT, TIT, SEA, EAT, HIE, ITS, ASH, TAT, HAS, SHE, HIS, ETA, ATE
Bonus words:
STAITHE, ATHEIST, THEIST, TITHES, SAITHE, THETAS, TESTAE, HEATS, TITHE, TESTA, TEATS, SETAE, TETHS, HAETS, TATES, SAITH, THETA, HIST, SETT, SETA, ATES, TATS, SITH, SATE, SITE, EAST, TEST, HEST, THAT, SEAT, AHIS, TITS, SHIT, HAET, AITS, EATH, HAES, ETAS, ETHS, SHEA, TEAT, TEES, HATS, THEE, TIES, EATS, STAT, HAST, TEAS, TATE, THAI, HITS, TEE, HAT, SET, SIT, THE, HIT, TEA, SAT, TIE, SEE, ATT, TIT, SEA, EAT, HIE, ITS, ASH, TAT, HAS, SHE, HIS, ETA, ATE