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Level 13 - NNPAOGIL
The answer to this puzzle is:
Words: PLANING, LOANING, LOPING, PANINO, POLING, PINANG, LIGNAN, PALING, LONGAN, PINNAL, LOGAN, OPING, APING, NOPAL, PINNA, PINON, ANION, LIANG, PINGO, LINGA, LIGAN, GALOP, ALGIN, GONIA, ALOIN, LOGIA, GIPON, PAIL, NONA, LION, GAOL, PION, LINO, PLAN, PIAN, PINA, ANIL, LINN, GLIA, PAIN, ANON, LAIN, AGIN, LOIN, PANG, AGON, LIPA, PONG, PING, NIPA, LANG, GLOP, AGIO, LING, POI, PAL, INN, LIP, ION, GAL, GAP, OIL, GIN, PAN, PIG, AGO, LOG, LAG, NAN, POL, NOG, AIL, ANI, PIN, NIP, LIN, LAP, NAP, NIL, NAG, LOP
Bonus words:
PLANING, LOANING, LOPING, PANINO, POLING, PINANG, LIGNAN, PALING, LONGAN, PINNAL, LOGAN, OPING, APING, NOPAL, PINNA, PINON, ANION, LIANG, PINGO, LINGA, LIGAN, GALOP, ALGIN, GONIA, ALOIN, LOGIA, GIPON, PAIL, NONA, LION, GAOL, PION, LINO, PLAN, PIAN, PINA, ANIL, LINN, GLIA, PAIN, ANON, LAIN, AGIN, LOIN, PANG, AGON, LIPA, PONG, PING, NIPA, LANG, GLOP, AGIO, LING, POI, PAL, INN, LIP, ION, GAL, GAP, OIL, GIN, PAN, PIG, AGO, LOG, LAG, NAN, POL, NOG, AIL, ANI, PIN, NIP, LIN, LAP, NAP, NIL, NAG, LOP