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Level 21 - IHTEOLN
The answer to this puzzle is:
Words: NEOLITH, EOLITH, ETHION, ENTOIL, TOILE, INLET, THOLE, LENTO, THEIN, LITHE, THIOL, HELIO, LITHO, TELOI, THINE, OLEIN, HELOT, ELOIN, ELINT, LENT, LOIN, HOLT, LINO, HELO, LENO, TINE, HEIL, LIEN, HENT, INTO, ELHI, LION, ENOL, LOTI, LONE, LOTH, NITE, TILE, LITE, HIE, OLE, NET, LOT, LET, HIT, OIL, TON, NOT, HEN, THE, ONE, TIE, TIN, HOE, HOT, LIE, TEN, NIT, HON, THO, LEI, NTH, LIN, NIL, TIL, TOE, LIT, ION, TEL, EON
Bonus words:
NEOLITH, EOLITH, ETHION, ENTOIL, TOILE, INLET, THOLE, LENTO, THEIN, LITHE, THIOL, HELIO, LITHO, TELOI, THINE, OLEIN, HELOT, ELOIN, ELINT, LENT, LOIN, HOLT, LINO, HELO, LENO, TINE, HEIL, LIEN, HENT, INTO, ELHI, LION, ENOL, LOTI, LONE, LOTH, NITE, TILE, LITE, HIE, OLE, NET, LOT, LET, HIT, OIL, TON, NOT, HEN, THE, ONE, TIE, TIN, HOE, HOT, LIE, TEN, NIT, HON, THO, LEI, NTH, LIN, NIL, TIL, TOE, LIT, ION, TEL, EON