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Level 1 - PLSIWOL
The answer to this puzzle is:
Words: LILOS, WILLS, POLIS, PLOWS, SWILL, LISP, OWLS, LILO, ILLS, LOWS, WISP, OILS, SOLI, SLOP, SLOW, LOPS, SILO, SILL, POIS, POLS, PLOW, PISO, PILL, LIPS, OPS, SOW, WOP, LOP, SOP, SOL, PSI, POW, POL, POI, OIL
Bonus words:
LILOS, WILLS, POLIS, PLOWS, SWILL, LISP, OWLS, LILO, ILLS, LOWS, WISP, OILS, SOLI, SLOP, SLOW, LOPS, SILO, SILL, POIS, POLS, PLOW, PISO, PILL, LIPS, OPS, SOW, WOP, LOP, SOP, SOL, PSI, POW, POL, POI, OIL