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Level 1 - OISLNSE
The answer to this puzzle is:
Words: INSOLES, EOSINS, OLEINS, NOISES, NOESIS, LESION, SONSIE, ELOINS, ENOSIS, INSOLE, ESSOIN, OSSEIN, LOSES, OLEIN, LOINS, ELOIN, NOELS, SOLES, NOILS, ISLES, NOSES, LENOS, LINOS, LIENS, SILOS, SINES, SLOES, LOESS, SOILS, SOLEI, EOSIN, SONES, LENIS, LESS, LOSE, LINS, SOLE, NILS, SOIL, SONS, SEIS, SINS, OILS, ONES, ENOL, LIES, SILO, LENO, LENS, LIEN, LINO, LOIN, LONE, NESS, LION, SINE, IONS, SLOE, SOLI, SONE, LEIS, EONS, EON, INS, ONE, ION, LEI, LIN, SIS, SOL, LES, NOS, OLE, SEN, NIL
Bonus words:
INSOLES, EOSINS, OLEINS, NOISES, NOESIS, LESION, SONSIE, ELOINS, ENOSIS, INSOLE, ESSOIN, OSSEIN, LOSES, OLEIN, LOINS, ELOIN, NOELS, SOLES, NOILS, ISLES, NOSES, LENOS, LINOS, LIENS, SILOS, SINES, SLOES, LOESS, SOILS, SOLEI, EOSIN, SONES, LENIS, LESS, LOSE, LINS, SOLE, NILS, SOIL, SONS, SEIS, SINS, OILS, ONES, ENOL, LIES, SILO, LENO, LENS, LIEN, LINO, LOIN, LONE, NESS, LION, SINE, IONS, SLOE, SOLI, SONE, LEIS, EONS, EON, INS, ONE, ION, LEI, LIN, SIS, SOL, LES, NOS, OLE, SEN, NIL