a-a a-b aaa aab aad aan aao aas aau ab- aba abb abd abn abo abs abu ad- ada adb add adn ado ads adu an- ana anb and ann ano ans anu aoa aob aod aon aoo aos aou as- asa asb asd asn aso ass asu au- aua aub aud aun auo aus b-u baa bab bad ban bao bas bau bba bbb bbd bbn bbo bbs bbu bda bdb bdd bdo bds bdu bna bnb bnd bnn bno bns bnu boa bob bod bon boo bos bou bsa bsb bsd bsn bso bss bsu bua bub bud bun buo bus buu daa dab dad dan dao das dau dba dbb dbd dbn dbo dbs dbu dda ddb ddd ddn ddo dds ddu dna dnb dnd dnn dno dns doa dob dod don doo dos dou dsa dsb dsd dsn dso dss dsu dua dub dud dun duo dus naa nab nad nan nao nas nau nba nbb nbd nbn nbo nbs nbu nda ndb ndd ndn ndo nds ndu nna nnb nnn nno nns nnu no- noa nob nod non noo nos nou nsa nsb nsd nsn nso nss nsu nua nub nud nun nuo nus nuu oaa oab oad oan oao oas oau ob- oba obb obd obn obo obs obu oda odb odd odn odo ods odu on- ona onb ond onn ono ons onu oo- ooa oob ood oon ooo oos os- osa osb osd osn oso oss osu ou- oua oud oun ouo ous saa sab sad san sao sas sau sba sbb sbd sbn sbo sbs sbu sda sdb sdd sdn sdo sds sdu sna snb snd snn sno sns snu soa sob sod son soo sos sou ss- ssa ssb ssd ssn sso sss ssu sua sub sud sun suo sus suu ua- uaa uab uad uan uao uas uau uba ubb ubn ubo ubs ubu uda udb udd udn udo uds udu un- una unb und unn uno uns unu uoa uob uod uon uoo uos usa usb usd usn uso uss usu uua uun uus uuu