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Level 22 - TSNPRI
The answer to this puzzle is:
Words: SPIRT, SPRIT, PIRNS, PINTS, STIRP, PINS, NITS, RIPS, NIPS, RINS, SNIT, SNIP, TINS, PINT, TIPS, PITS, SIN, INS, ITS, PSI, NIT, NIP, RIP
Bonus words:
SPIRT, SPRIT, PIRNS, PINTS, STIRP, PINS, NITS, RIPS, NIPS, RINS, SNIT, SNIP, TINS, PINT, TIPS, PITS, SIN, INS, ITS, PSI, NIT, NIP, RIP