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Level 12 - LPLIOGN
The answer to this puzzle is:
Words: POLING, LOPING, OPING, PINGO, GIPON, LILO, GILL, PION, LINO, LOIN, GLOP, LING, LOP, POL, OIL, LOG, PIG, GIN, NIL, LIN, PIN, NOG, NIP, POI
Bonus words:
POLING, LOPING, OPING, PINGO, GIPON, LILO, GILL, PION, LINO, LOIN, GLOP, LING, LOP, POL, OIL, LOG, PIG, GIN, NIL, LIN, PIN, NOG, NIP, POI