bbb bbe bbk bbn bbo bbt be- beb bee bek ben beo bet bkb bke bkk bkn bko bkt bnb bne bnk bnn bno bnt bob boe bok bon boo bot btb bte btk btn bto btt ebb ebe ebk ebn ebo ebt eeb eee eek een eeo eet ekb eke eko ekt en- enb ene enk enn eno ent eo- eob eoe eok eon eoo eot etb ete etk etn eto ett k-t kbb kbe kbk kbn kbo ke- keb kee kek ken keo ket kkb kke kkk kkn kkt kn- kne knk knn kno knt kob koe kok kon koo kot ktb kte ktk ktn kto ktt nbb nbe nbk nbn nbo nbt ne- neb nee nek nen neo net nke nkk nkn nko nkt nnb nne nnk nnn nno nnt no- nob noe nok non noo not ntb nte ntk ntn nto ntt ob- obb obe obk obn obo obt oeb oee oen oeo oet okb oke okk oko on- onb one onk onn ono ont oo- oob ook oon ooo oot ot- otb ote otk otn oto ott tbb tbe tbk tbn tbo tbt te- teb tee tek ten teo tet tkb tke tkk tko tkt tnb tne tnk tnn tno tnt to- tob toe tok ton too tot ttb tte ttk ttn tto ttt