bbb bbi bbk bbn bbo bbt bi- bib bii bik bin bio bit bkb bkk bkn bko bkt bnb bni bnk bnn bno bnt bob boi bok bon boo bot btb bti btk btn bto btt ibb ibi ibk ibn ibo ibt iib iii iin iio iit ikb iki ikk iko ikt in- inb ini ink inn ino int io- iob ioi ion ioo iot itb iti itk itn ito itt k-t kbb kbi kbk kbn kbo kib kii kik kin kio kit kkb kki kkk kkn kkt kn- kni knk knn kno knt kob koi kok kon koo kot ktb ktk ktn kto ktt n-i nbb nbi nbk nbn nbo nbt nib nii nik nin nio nit nki nkk nkn nko nkt nnb nni nnk nnn nno nnt no- nob noi nok non noo not ntb nti ntk ntn nto ntt o-i ob- obb obi obk obn obo obt oib oii oik oin oio oit okb oki okk oko on- onb oni onk onn ono ont oo- oob ooi ook oon ooo oot ot- otb oti otk otn oto ott tbb tbi tbk tbn tbo tbt tib tii tik tin tio tit tkb tkk tko tkt tnb tni tnk tnn tno tnt to- tob toi tok ton too tot ttb tti ttk ttn tto ttt