-ey b-u bbb bbe bbk bbo bbu bby be- beb bee bek beo beu bey bez bkb bke bkk bko bob boe bok boo bou boy boz bub bue buk buo buu buy buz by- bye byk byo byu byz bze bzo bzu bzz ebb ebe ebk ebo ebu eby eeb eee eek eeo eey ekb eke eko eku eky eo- eob eoe eok eoo eou eu- eub eue eye eyo eze ezo ezz k-z kbb kbe kbk kbo kbu kbz ke- keb kee kek keo key kez kkb kke kkk kku kky kob koe kok koo kou koy koz kub kue kuk kuu kuy kye kyo kyu kyz kzo kzy ob- obb obe obk obo obu oby oeb oee oeo oey okb oke okk oko oku oo- oob ook ooo ou- oue ouk ouo oye oyo oze ozo ozu ozz ubb ube ubk ubo ubu uby ueb uee uey ukb uke ukk uku ukz uob uoe uok uoo uue uuu uyo uyu uzb uzo uzu ybe yby ybz yeb yee yek yeo yey yez ykk yob yoe yok yoo you yoy yue yuk yuo yuu yuy yyb yye yyu yyy yyz yzb yzu yzy zbb zby zeb zee zek zeo zez zo- zob zoe zok zoo zou zub zuk zuz zzy zzz