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Level 21 - LEALTH
The answer to this puzzle is:
Words: LATHE, EATH, HAET, HALE, LATH, LEAL, TEAL, TELA, ALT, ATE, ETA, LAT, LEA, TEL, THE
Bonus words:
LATHE, EATH, HAET, HALE, LATH, LEAL, TEAL, TELA, ALT, ATE, ETA, LAT, LEA, TEL, THE