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Level 12 - NIEIDETF
The answer to this puzzle is:
Words: FEINTED, ENDITE, INDITE, TINEID, NITID, TEIID, TEIND, TINED, FEINT, DIENE, FINED, FETED, FETID, DEFT, DENI, NITE, DINT, INTI, TINE, TIED, FETE, DITE, DINE, DEFI, EIDE, DEET, FINE, FIND, DENE, TEN, FIE, FED, TIN, END, NET, DEN, FEE, DIE, FIT, DIN, NEE, DIT, TEE, FIN, TED, DEF, NIT, TIE, FEN
Bonus words:
FEINTED, ENDITE, INDITE, TINEID, NITID, TEIID, TEIND, TINED, FEINT, DIENE, FINED, FETED, FETID, DEFT, DENI, NITE, DINT, INTI, TINE, TIED, FETE, DITE, DINE, DEFI, EIDE, DEET, FINE, FIND, DENE, TEN, FIE, FED, TIN, END, NET, DEN, FEE, DIE, FIT, DIN, NEE, DIT, TEE, FIN, TED, DEF, NIT, TIE, FEN