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Level 21 - EFRYILB
The answer to this puzzle is:
Words: RIFELY, BELFRY, REFLY, FLIER, LIFER, BERYL, LIBER, RILEY, FILER, REIFY, FIERY, FIBRE, FERLY, BIRLE, FIBER, BYRE, FLIR, BIRL, RIEL, LIER, RILE, FLEY, BYRL, LIEF, FILE, FIRE, BILE, LYRE, RIFE, RELY, BIER, BRIE, LIRE, REF, LIE, ELF, FRY, FIR, LIB, IRE, RYE, LEI, FIB, RIB, LYE, BEY, REB, FIE, FER
Bonus words:
RIFELY, BELFRY, REFLY, FLIER, LIFER, BERYL, LIBER, RILEY, FILER, REIFY, FIERY, FIBRE, FERLY, BIRLE, FIBER, BYRE, FLIR, BIRL, RIEL, LIER, RILE, FLEY, BYRL, LIEF, FILE, FIRE, BILE, LYRE, RIFE, RELY, BIER, BRIE, LIRE, REF, LIE, ELF, FRY, FIR, LIB, IRE, RYE, LEI, FIB, RIB, LYE, BEY, REB, FIE, FER