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Level 1 - PGNNAIOL
The answer to this puzzle is:
Words: PLANING, LOANING, PINANG, LIGNAN, PINNAL, LOPING, POLING, PALING, LONGAN, PANINO, APING, GIPON, NOPAL, LINGA, LIANG, ANION, PINON, PINNA, LOGAN, OPING, GONIA, LOGIA, ALGIN, LIGAN, GALOP, PINGO, ALOIN, GLIA, LINN, ANIL, LING, LION, PINA, LINO, NONA, PAIN, GAOL, PAIL, GOAL, LONG, PIAN, AGIN, ANON, NIPA, AGIO, LANG, GLOP, AGON, LIPA, OPAL, LAIN, LOIN, PANG, PION, PIN, LOP, ION, PAN, GIN, PIG, AGO, LOG, OIL, GAP, INN, PAL, LIP, GAL, ANI, LAG, NAN, LAP, NAP, NIL, NAG, LIN, NIP, NOG, POL, AIL, POI
Bonus words:
PLANING, LOANING, PINANG, LIGNAN, PINNAL, LOPING, POLING, PALING, LONGAN, PANINO, APING, GIPON, NOPAL, LINGA, LIANG, ANION, PINON, PINNA, LOGAN, OPING, GONIA, LOGIA, ALGIN, LIGAN, GALOP, PINGO, ALOIN, GLIA, LINN, ANIL, LING, LION, PINA, LINO, NONA, PAIN, GAOL, PAIL, GOAL, LONG, PIAN, AGIN, ANON, NIPA, AGIO, LANG, GLOP, AGON, LIPA, OPAL, LAIN, LOIN, PANG, PION, PIN, LOP, ION, PAN, GIN, PIG, AGO, LOG, OIL, GAP, INN, PAL, LIP, GAL, ANI, LAG, NAN, LAP, NAP, NIL, NAG, LIN, NIP, NOG, POL, AIL, POI