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Level 12 - NTVSIIIG
The answer to this puzzle is:
Words: SITING, VISING, INTIS, TINGS, INTI, NISI, GITS, SNIT, NITS, GINS, TING, TINS, GIN, GIT, NIT, INS, ITS
Bonus words:
SITING, VISING, INTIS, TINGS, INTI, NISI, GITS, SNIT, NITS, GINS, TING, TINS, GIN, GIT, NIT, INS, ITS