b-u bbb bbk bbn bbo bbs bbu bby bkb bkk bkn bko bks bnb bnk bnn bno bns bnu bob bok bon boo bos bou boy bsb bsk bsn bso bss bsu bsy bub buk bun buo bus buu buy by- byk byn byo bys byu kbb kbk kbn kbo kbs kbu kkb kkk kkn kks kku kky kn- knk knn kno knu kob kok kon koo kos kou koy ksb ksk ksn kso kss ksu kub kuk kun kus kuu kuy kyn kyo kys kyu nbb nbk nbn nbo nbs nbu nkk nkn nko nks nku nky nnb nnk nnn nno nns nnu no- nob nok non noo nos nou noy nsb nsk nsn nso nss nsu nsy nub nuk nun nuo nus nuu nuy nyk nyn nyo nys nyu nyy ob- obb obk obn obo obs obu oby okb okk oko oks oku on- onb onk onn ono ons onu ony oo- oob ook oon ooo oos os- osb osk osn oso oss osu ou- ouk oun ouo ous oyo oys sbb sbk sbn sbo sbs sbu sby sk- skb skk sko sks sku sky snb snk snn sno sns snu sny sob sok son soo sos sou soy ss- ssb ssk ssn sso sss ssu sub suk sun suo sus suu suy sy- syb syk syn sys syu ubb ubk ubn ubo ubs ubu uby ukb ukk ukn uku un- unb unk unn uno uns unu uny uob uok uon uoo uos usb usk usn uso uss usu uun uus uuu uyo uys uyu ybs yby ykk ykn ynk ynn yns ynu yny yob yok yon yoo yos you yoy ysb ysk yso yss ysu ysy yuk yun yuo yus yuu yuy yyb yys yyu yyy