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7 letter words:

boiloff15,

5 letter words:

biffo13, boffo13, folio8, oboli7,

4 letter words:

biff12, boff12, filo7, foil7, fool7, loof7, boil6, bolo6, bool6, lobi6, lobo6, obol6, olio4,

3 letter words:

iff9, off9, fib8, fob8, fil6, oof6, bio5, boi5, boo5, lib5, lob5, obi5, obo5, loo3, oil3,

2 letter words:

if5, of5, bi4, bo4, ob4, io2, li2, lo2, oi2, oo2,