a-a a-b aaa aab aad aag aar aas aau ab- aba abb abd abg abr abs abu ad- ada adb add adg adr ads adu ag- aga agb agd agg agr ags agu ar- ara arb ard arg arr ars aru as- asa asb asd asg asr ass asu au- aua aub aud aug aur aus b-u baa bab bad bag bar bas bau bba bbb bbd bbg bbr bbs bbu bda bdb bdd bdg bdr bds bdu bga bgb bgd bgg bgr bgs bgu bra brb brd brg brr brs bru bsa bsb bsd bsg bsr bss bsu bua bub bud bug bur bus buu daa dab dad dag dar das dau dba dbb dbd dbg dbr dbs dbu dda ddb ddd ddg ddr dds ddu dga dgd dgg dgr dgs dgu dra drb drd drg drr drs dru dsa dsb dsd dsg dsr dss dsu dua dub dud dug dur dus g-d gaa gab gad gag gar gas gau gba gbd gbg gbr gbs gbu gda gdb gdd gdr gds gdu gga ggb ggd ggg ggr ggs ggu gra grb grd grg grr grs gru gsa gsb gsd gsg gsr gss gsu gu- gua gub gud gug gur gus guu ra- raa rab rad rag rar ras rau rba rbb rbd rbg rbr rbs rbu rda rdb rdd rdg rdr rds rdu rga rgb rgd rgg rgr rgs rra rrb rrd rrg rrr rrs rru rsa rsb rsd rsg rsr rss rsu rua rub rud rug rur rus ruu saa sab sad sag sar sas sau sba sbb sbd sbg sbr sbs sbu sda sdb sdd sdg sdr sds sdu sga sgb sgd sgg sgr sgs sgu sr- sra srb srd srg srr srs ss- ssa ssb ssd ssg ssr sss ssu sua sub sud sug sur sus suu ua- uaa uab uad uag uar uas uau uba ubb ubg ubr ubs ubu uda udb udd udg udr uds udu uga ugb ugg ugr ugs ugu ur- ura urb urd urg urr urs uru usa usb usd usg usr uss usu uua uug uur uus uuu