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Level 19 - IADEFL
The answer to this puzzle is:
Words: AFIELD, FLIED, FILED, AILED, FELID, FLED, FILA, FEAL, DELF, DEFI, ALIF, ALEF, LIEF, LIED, LAID, AIDE, LADE, LEAD, FLEA, DALE, DEIL, DELI, DIEL, AIL, DEF, DEL, LAD, ELD, FAD, FED, LID, LEI, LED, LEA, FIE, ELF
Bonus words:
AFIELD, FLIED, FILED, AILED, FELID, FLED, FILA, FEAL, DELF, DEFI, ALIF, ALEF, LIEF, LIED, LAID, AIDE, LADE, LEAD, FLEA, DALE, DEIL, DELI, DIEL, AIL, DEF, DEL, LAD, ELD, FAD, FED, LID, LEI, LED, LEA, FIE, ELF