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Level 16 - PSTILO
The answer to this puzzle is:
Words: SPOILT, PILOTS, SPILT, POSIT, SLIPT, PLOTS, TOILS, TOPIS, POLIS, LISP, POTS, POLS, POIS, LOTI, PITS, LOTS, OPTS, TIPS, OILS, LOPS, TOPS, TOPI, TOIL, PISO, SOLI, SLOP, SLIT, SILT, SILO, SOIL, LIPS, LIP, SIT, LIT, TIP, OIL, ITS, OPS, TIL, SOT, SOP, SOL, PSI, POL, POI, LOP, LOT
Bonus words:
SPOILT, PILOTS, SPILT, POSIT, SLIPT, PLOTS, TOILS, TOPIS, POLIS, LISP, POTS, POLS, POIS, LOTI, PITS, LOTS, OPTS, TIPS, OILS, LOPS, TOPS, TOPI, TOIL, PISO, SOLI, SLOP, SLIT, SILT, SILO, SOIL, LIPS, LIP, SIT, LIT, TIP, OIL, ITS, OPS, TIL, SOT, SOP, SOL, PSI, POL, POI, LOP, LOT