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Level 12 - NFHISEDI
The answer to this puzzle is:
Words: FIENDISH, INDIES, FISHED, FIENDS, SHINED, NEIFS, FINED, DINES, FINIS, HIDES, SNIDE, SHIED, HINDS, FENDS, FINES, NIDES, SIDHE, SHEND, NISEI, DEFIS, FEHS, EDHS, DIFS, HISN, DEFI, HINS, SINH, FIDS, DINS, DENI, NISI, FENS, IDES, FISH, FINS, ENDS, DINE, DIES, HIDE, SINE, SHIN, FEDS, HENS, DENS, HIND, END, FED, DIE, SIN, HEN, HIS, DEN, IDS, DIN, SHE, INS, SEN, FIN, HID, DIS, DEF, HIE, EDS, FIE, FEN
Bonus words:
FIENDISH, INDIES, FISHED, FIENDS, SHINED, NEIFS, FINED, DINES, FINIS, HIDES, SNIDE, SHIED, HINDS, FENDS, FINES, NIDES, SIDHE, SHEND, NISEI, DEFIS, FEHS, EDHS, DIFS, HISN, DEFI, HINS, SINH, FIDS, DINS, DENI, NISI, FENS, IDES, FISH, FINS, ENDS, DINE, DIES, HIDE, SINE, SHIN, FEDS, HENS, DENS, HIND, END, FED, DIE, SIN, HEN, HIS, DEN, IDS, DIN, SHE, INS, SEN, FIN, HID, DIS, DEF, HIE, EDS, FIE, FEN