TUBIFICIDS

bi id if is it si ti us ut

bid bis bit bud bus but cis cub cud cut dib dif dis dit dub dui fib fid fit fub fud ids ifs its sib sic sit sub tic tis tub tui uts

bidi bids bits buds bust buts cist cubs cuds cuif cuts dibs difs disc dits dubs duci duct duit dust fibs fids fisc fist fits fubs fuci fuds ibis scud scut sift stub stud suit tics tubs tuis