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Level 12 - IAFLNIG
The answer to this puzzle is:
Words: FINIAL, NILGAI, AILING, LINGA, ALGIN, FAGIN, LIANG, LIGAN, FLAN, ANIL, FAIN, GLIA, LING, ALIF, FILA, LAIN, ILIA, AGIN, LANG, INIA, FAG, FIN, FIG, FAN, NIL, LIN, ANI, AIL, GIN
Bonus words:
FINIAL, NILGAI, AILING, LINGA, ALGIN, FAGIN, LIANG, LIGAN, FLAN, ANIL, FAIN, GLIA, LING, ALIF, FILA, LAIN, ILIA, AGIN, LANG, INIA, FAG, FIN, FIG, FAN, NIL, LIN, ANI, AIL, GIN