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Level 13 - NSGVLIO
The answer to this puzzle is:
Words: LOGINS, SOLING, VOLING, VINOS, LINGS, LONGS, LINOS, NOILS, VIOLS, LOINS, VINO, GINS, SLOG, LINO, NILS, VIOL, OILS, LING, LONG, LOGS, LOIN, SOLI, IONS, LINS, NOG, ION, OIL, LOG, INS, NOS, LIN, NIL, SOL, GIN
Bonus words:
LOGINS, SOLING, VOLING, VINOS, LINGS, LONGS, LINOS, NOILS, VIOLS, LOINS, VINO, GINS, SLOG, LINO, NILS, VIOL, OILS, LING, LONG, LOGS, LOIN, SOLI, IONS, LINS, NOG, ION, OIL, LOG, INS, NOS, LIN, NIL, SOL, GIN