b-u bbb bbe bbk bbo bbt bbu be- beb bee bek beo bet beu bkb bke bkk bko bkt bob boe bok boo bot bou btb bte btk bto btt btu bub bue buk buo but buu ebb ebe ebk ebo ebt ebu eeb eee eek eeo eet ekb eke eko ekt eku eo- eob eoe eok eoo eot eou etb ete etk eto ett etu eu- eub eue eut k-t kbb kbe kbk kbo kbu ke- keb kee kek keo ket kkb kke kkk kkt kku kob koe kok koo kot kou ktb kte ktk kto ktt ktu kub kue kuk kut kuu ob- obb obe obk obo obt obu oeb oee oeo oet okb oke okk oko oku oo- oob ook ooo oot ot- otb ote otk oto ott otu ou- oue ouk ouo out tbb tbe tbk tbo tbt tbu te- teb tee tek teo tet teu tkb tke tkk tko tkt to- tob toe tok too tot tou ttb tte ttk tto ttt ttu tub tue tuk tuo tut tuu ubb ube ubk ubo ubt ubu ueb uee uet ukb uke ukk uku uob uoe uok uoo uot utb ute utk uto utt utu uue uut uuu