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Level 1 - NLOTIRLI
The answer to this puzzle is:
Words: LINTOL, NITRIL, TRILL, TRIOL, TORII, LIROT, INRO, NORI, ROTI, LINO, TORI, INTO, INTI, NOIR, TRIO, LILT, LOIN, TIRO, LOTI, ROIL, RILL, TILL, LILO, TIN, NIT, LIN, NIL, ION, ILL, LIT, TIL, TON, NOR, LOT, TOR
Bonus words:
LINTOL, NITRIL, TRILL, TRIOL, TORII, LIROT, INRO, NORI, ROTI, LINO, TORI, INTO, INTI, NOIR, TRIO, LILT, LOIN, TIRO, LOTI, ROIL, RILL, TILL, LILO, TIN, NIT, LIN, NIL, ION, ILL, LIT, TIL, TON, NOR, LOT, TOR