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Level 13 - NFADULH
The answer to this puzzle is:
Words: UHLAN, FAULD, ULNAD, LAUD, FLAN, DAHL, ULNA, DHAL, LAND, FAUN, AULD, HULA, DAH, FAN, FUN, NAH, DUN, DUH, FAD, HAD
Bonus words:
UHLAN, FAULD, ULNAD, LAUD, FLAN, DAHL, ULNA, DHAL, LAND, FAUN, AULD, HULA, DAH, FAN, FUN, NAH, DUN, DUH, FAD, HAD