DISBUTTON

bi bo do id in is it no nu od oi on os si so ti to un us ut

bid bin bio bis bit bod bos bot bud bun bus but dib din dis dit don dos dot dub dui dun duo ids ins ion its nib nit nob nod nos not nub nus nut obi ods ons oud out sib sin sit sob sod son sot sou sub sun tin tis tit tod ton tot tub tui tun tut udo uns uts

bids bind bins bint bios bits bitt bods bond bots bott bout buds bund buns bunt bust buts butt dibs dino dins dint dits doit dons dost dots dubs duit duns dunt duos dust into ions nibs nits nobs nodi nods nous nubs nuts obis obit onus ouds oust outs snib snit snob snot snub stob stot stub stud stun suit tins tint tits tods toit tons tost tots tout tubs tuis tuns tuts udon udos undo unit unto