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Level 22 - HGIPNIPS
The answer to this puzzle is:
Words: SIPPING, HIPPING, PISHING, PIPINGS, SIPING, PIPING, NIGHS, PINGS, PIING, NIGH, NIPS, GINS, PIPS, SINH, NISI, HIPS, PISH, HINS, SIGH, GHIS, HISN, PIGS, PINS, GIPS, PSI, PIG, GIN, HIS, HIP, SIN, PHI, PIP, NIP, INS, PIN
Bonus words:
SIPPING, HIPPING, PISHING, PIPINGS, SIPING, PIPING, NIGHS, PINGS, PIING, NIGH, NIPS, GINS, PIPS, SINH, NISI, HIPS, PISH, HINS, SIGH, GHIS, HISN, PIGS, PINS, GIPS, PSI, PIG, GIN, HIS, HIP, SIN, PHI, PIP, NIP, INS, PIN