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Level 21 - EELSTTS
The answer to this puzzle is:
Words: TSETSE, SLEETS, SETTLE, SESTET, STELES, STEELS, TESTES, TEELS, LESES, SEELS, LEETS, SETTS, STETS, SLEET, TELES, STELE, SETS, SETT, SEES, EELS, TELE, LEES, TEES, LEST, LEET, LEE, TEL, LES
Bonus words:
TSETSE, SLEETS, SETTLE, SESTET, STELES, STEELS, TESTES, TEELS, LESES, SEELS, LEETS, SETTS, STETS, SLEET, TELES, STELE, SETS, SETT, SEES, EELS, TELE, LEES, TEES, LEST, LEET, LEE, TEL, LES