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Level 42 - EAIFDL
The answer to this puzzle is:
Words: AFIELD, AILED, FILED, FLIED, FELID, ALIF, LAID, LADE, AIDE, FLEA, ALEF, DEFI, LIED, DELF, FEAL, DIEL, DELI, FILA, DEIL, DALE, FLED, LIEF, LAD, LEI, LED, LEA, FIE, FED, FAD, ELF, ELD, DEL, DEF, AIL, LIE
Bonus words:
AFIELD, AILED, FILED, FLIED, FELID, ALIF, LAID, LADE, AIDE, FLEA, ALEF, DEFI, LIED, DELF, FEAL, DIEL, DELI, FILA, DEIL, DALE, FLED, LIEF, LAD, LEI, LED, LEA, FIE, FED, FAD, ELF, ELD, DEL, DEF, AIL, LIE