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Level 5 - SDIENIHF
The answer to this puzzle is:
Words: FIENDISH, FIENDS, FISHED, SHINED, INDIES, FINED, FENDS, SHIED, HIDES, HINDS, SNIDE, FINIS, DINES, NISEI, SIDHE, NIDES, SHEND, DEFIS, NEIFS, DENI, IDES, NISI, DISH, ENDS, DIFS, SEND, DEFI, HIND, HISN, EDHS, FEHS, FENS, DINS, HINS, FIDS, FINS, SHIN, SINE, DIES, DENS, SHED, HENS, FEDS, SINH, HIDE, FEN, DIE, SIN, FED, DEN, END, SHE, HIS, HEN, DIN, INS, EDS, IDS, FIE, DEF, DIS, SEN, FIN, HID, HIE
Bonus words:
FIENDISH, FIENDS, FISHED, SHINED, INDIES, FINED, FENDS, SHIED, HIDES, HINDS, SNIDE, FINIS, DINES, NISEI, SIDHE, NIDES, SHEND, DEFIS, NEIFS, DENI, IDES, NISI, DISH, ENDS, DIFS, SEND, DEFI, HIND, HISN, EDHS, FEHS, FENS, DINS, HINS, FIDS, FINS, SHIN, SINE, DIES, DENS, SHED, HENS, FEDS, SINH, HIDE, FEN, DIE, SIN, FED, DEN, END, SHE, HIS, HEN, DIN, INS, EDS, IDS, FIE, DEF, DIS, SEN, FIN, HID, HIE