b-u bbb bbc bbd bbk bbo bbs bbu bcb bcc bcd bck bco bcs bcu bdb bdc bdd bdk bdo bds bdu bkb bkc bkk bko bks bob boc bod bok boo bos bou bsb bsc bsd bsk bso bss bsu bub buc bud buk buo bus buu c-- cbb cbc cbd cbk cbo cbs cbu ccb ccc ccd cck cco ccs ccu cdb cdc cdd cdk cdo cds cdu ckb ckc ckd cko cks co- cob coc cod cok coo cos cou csb csc csd csk cso css csu cub cuc cud cuk cuo cus cuu dbb dbc dbd dbk dbo dbs dbu dcb dcc dcd dck dco dcs dcu ddb ddc ddd ddk ddo dds ddu dkb dkc dkk dko dks dku dob doc dod dok doo dos dou dsb dsc dsd dsk dso dss dsu dub duc dud duk duo dus kbb kbc kbd kbk kbo kbs kbu kcb kcc kcd kck kcs kcu kdb kdc kdk kdo kds kdu kkb kkc kkk kks kku kob koc kod kok koo kos kou ksb ksc ksd ksk kso kss ksu kub kuc kud kuk kus kuu ob- obb obc obd obk obo obs obu oc- ocb occ ocd ock oco ocs ocu odb odc odd odo ods odu okb okc okd okk oko oks oku oo- oob ooc ood ook ooo oos os- osb osc osd osk oso oss osu ou- ouc oud ouk ouo ous sbb sbc sbd sbk sbo sbs sbu scb scc scd sck sco scs scu sdb sdc sdd sdk sdo sds sdu sk- skb skc skd skk sko sks sku sob soc sod sok soo sos sou ss- ssb ssc ssd ssk sso sss ssu sub suc sud suk suo sus suu ubb ubc ubk ubo ubs ubu ucb ucc ucd uck uco ucs ucu udb udc udd udk udo uds udu ukb ukc ukk uku uob uoc uod uok uoo uos usb usc usd usk uso uss usu uuc uus uuu

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