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Level 21 - FNGITHIG
The answer to this puzzle is:
Words: INFIGHT, INTI, NIGH, TING, FIG, FIT, GIN, NTH, NIT, TIN, FIN, GIT
Bonus words:
INFIGHT, INTI, NIGH, TING, FIG, FIT, GIN, NTH, NIT, TIN, FIN, GIT