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Level 23 - IONLLTIR
The answer to this puzzle is:
Words: LINTOL, NITRIL, TORII, TRIOL, TRILL, LIROT, NORI, LILT, ROTI, INTI, LINO, LILO, TORI, NOIR, LOTI, INRO, RILL, INTO, TRIO, TILL, TIRO, ROIL, LOIN, TOR, OIL, TON, NOR, LOT, TIL, ION, NIT, LIN, NIL, ROT, TIN
Bonus words:
LINTOL, NITRIL, TORII, TRIOL, TRILL, LIROT, NORI, LILT, ROTI, INTI, LINO, LILO, TORI, NOIR, LOTI, INRO, RILL, INTO, TRIO, TILL, TIRO, ROIL, LOIN, TOR, OIL, TON, NOR, LOT, TIL, ION, NIT, LIN, NIL, ROT, TIN