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Level 13 - HFISIEND
The answer to this puzzle is:
Words: FIENDISH, SHINED, FISHED, FIENDS, INDIES, NEIFS, SNIDE, HIDES, FENDS, FINIS, SIDHE, HINDS, NISEI, SHIED, DINES, DEFIS, NIDES, FINED, SHEND, DEFI, FENS, DENI, NISI, SINH, DINS, FIDS, HINS, HISN, DIFS, EDHS, FEHS, IDES, DISH, FEND, SINE, FIND, HIND, ENDS, DIES, SHED, SHIN, FINS, HENS, FEDS, DENS, DEF, DIE, HIS, HEN, FEN, FIE, END, DEN, EDS, FED, SIN, HIE, DIS, DIN, SHE, INS, SEN, FIN, HID, IDS
Bonus words:
FIENDISH, SHINED, FISHED, FIENDS, INDIES, NEIFS, SNIDE, HIDES, FENDS, FINIS, SIDHE, HINDS, NISEI, SHIED, DINES, DEFIS, NIDES, FINED, SHEND, DEFI, FENS, DENI, NISI, SINH, DINS, FIDS, HINS, HISN, DIFS, EDHS, FEHS, IDES, DISH, FEND, SINE, FIND, HIND, ENDS, DIES, SHED, SHIN, FINS, HENS, FEDS, DENS, DEF, DIE, HIS, HEN, FEN, FIE, END, DEN, EDS, FED, SIN, HIE, DIS, DIN, SHE, INS, SEN, FIN, HID, IDS