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Level 13 - PTIINGNR
The answer to this puzzle is:
Words: TRINING, TIRING, PINING, RIPING, TINING, GRIPT, PIING, IRING, GIRN, PRIG, GIRT, TIPI, INTI, TING, GRIT, TRIG, GIT, RIG, NIT, GIN, NIP
Bonus words:
TRINING, TIRING, PINING, RIPING, TINING, GRIPT, PIING, IRING, GIRN, PRIG, GIRT, TIPI, INTI, TING, GRIT, TRIG, GIT, RIG, NIT, GIN, NIP