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Level 5 - TOINLRLI
The answer to this puzzle is:
Words: NITRIL, LINTOL, TRIOL, TRILL, TORII, LIROT, TIRO, LILO, LINO, INTI, ROTI, NORI, ROIL, LOTI, TOIL, LILT, INRO, TORI, LOIN, INTO, TRIO, TILL, NOIR, RILL, LOT, OIL, NOR, TON, LIT, NIT, TOR, LIN, NIL, ION, TIL
Bonus words:
NITRIL, LINTOL, TRIOL, TRILL, TORII, LIROT, TIRO, LILO, LINO, INTI, ROTI, NORI, ROIL, LOTI, TOIL, LILT, INRO, TORI, LOIN, INTO, TRIO, TILL, NOIR, RILL, LOT, OIL, NOR, TON, LIT, NIT, TOR, LIN, NIL, ION, TIL