a-a a-b aaa aab aad aag aan aao aas ab- aba abb abd abg abn abo abs ad- ada adb add adg adn ado ads ag- aga agb agd agg agn ago ags an- ana anb and ang ann ano ans aoa aob aod aog aon aoo aos as- asa asb asd asg asn aso ass baa bab bad bag ban bao bas bba bbb bbd bbg bbn bbo bbs bda bdb bdd bdg bdo bds bga bgb bgd bgg bgn bgo bgs bna bnb bnd bng bnn bno bns boa bob bod bog bon boo bos bsa bsb bsd bsg bsn bso bss daa dab dad dag dan dao das dba dbb dbd dbg dbn dbo dbs dda ddb ddd ddg ddn ddo dds dga dgd dgg dgn dgs dna dnb dnd dng dnn dno dns doa dob dod dog don doo dos dsa dsb dsd dsg dsn dso dss g-d gaa gab gad gag gan gao gas gba gbd gbg gbn gbo gbs gda gdb gdd gdn gdo gds gga ggb ggd ggg ggn ggo ggs gna gnb gnd gnn gno gns goa gob god gog gon goo gos gsa gsb gsd gsg gsn gso gss naa nab nad nag nan nao nas nba nbb nbd nbg nbn nbo nbs nda ndb ndd ndg ndn ndo nds nga ngb ngd ngg ngn ngo ngs nna nnb nng nnn nno nns no- noa nob nod nog non noo nos nsa nsb nsd nsg nsn nso nss oaa oab oad oag oan oao oas ob- oba obb obd obg obn obo obs oda odb odd odg odn odo ods oga ogd ogg ogn ogo ogs on- ona onb ond ong onn ono ons oo- ooa oob ood oog oon ooo oos os- osa osb osd osg osn oso oss saa sab sad sag san sao sas sba sbb sbd sbg sbn sbo sbs sda sdb sdd sdg sdn sdo sds sga sgb sgd sgg sgn sgo sgs sna snb snd sng snn sno sns soa sob sod sog son soo sos ss- ssa ssb ssd ssg ssn sso sss