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Level 19 - NGPSRIS
The answer to this puzzle is:
Words: SPRIGS, PINGS, SPRIG, PRIGS, PRISS, GRIPS, GRINS, GIRNS, SNIPS, PIRNS, SPINS, RIPS, RINS, RIGS, SINS, SIPS, SIRS, PING, SPIN, PIGS, PINS, GIRN, NIPS, GIPS, GINS, SNIP, PRIG, PISS, SIS, PSI, NIP, INS, PIG, RIG, GIN
Bonus words:
SPRIGS, PINGS, SPRIG, PRIGS, PRISS, GRIPS, GRINS, GIRNS, SNIPS, PIRNS, SPINS, RIPS, RINS, RIGS, SINS, SIPS, SIRS, PING, SPIN, PIGS, PINS, GIRN, NIPS, GIPS, GINS, SNIP, PRIG, PISS, SIS, PSI, NIP, INS, PIG, RIG, GIN