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Level 16 - NIFGHGIT
The answer to this puzzle is:
Words: INFIGHT, NIGH, TING, INTI, TIN, GIN, FIG, GIT, FIN, NIT, NTH
Bonus words:
INFIGHT, NIGH, TING, INTI, TIN, GIN, FIG, GIT, FIN, NIT, NTH