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Level 15 - IUQALYT
The answer to this puzzle is:
Words: LAITY, LATI, TALI, ALIT, LATU, LITU, QUAY, QUAI, TIL, TAU, LAT, AIL, ALT
Bonus words:
LAITY, LATI, TALI, ALIT, LATU, LITU, QUAY, QUAI, TIL, TAU, LAT, AIL, ALT