b-u bbb bbd bbo bbq bbs bbu bdb bdd bdo bdq bds bdu bob bod boo boq bos bou bqd bsb bsd bso bss bsu bub bud buo bus buu dbb dbd dbo dbq dbs dbu ddb ddd ddo ddq dds ddu dob dod doo doq dos dou dqs dsb dsd dso dsq dss dsu dub dud duo dus ob- obb obd obo obs obu odb odd odo ods odu oo- oob ood ooo oos oqb oqo os- osb osd oso osq oss osu ou- oud ouo ous qbd qbq qbs qdb qds qoo qos qqq qqu qsd qso qu- qud quo qus sbb sbd sbo sbq sbs sbu sdb sdd sdo sdq sds sdu sob sod soo soq sos sou sqd sqq sqs ss- ssb ssd sso ssq sss ssu sub sud suo suq sus suu ubb ubo ubs ubu udb udd udo uds udu uob uod uoo uos usb usd uso uss usu uus uuu