a-a a-b a-t aaa aab aad aag aar aat aau ab- aba abb abd abg abr abt abu ad- ada adb add adg adr adt adu ag- aga agb agd agg agr agt agu ar- ara arb ard arg arr art aru at- ata atb atd atg atr att atu au- aua aub aud aug aur aut b-u baa bab bad bag bar bat bau bba bbb bbd bbg bbr bbt bbu bda bdb bdd bdg bdr bdt bdu bga bgb bgd bgg bgr bgt bgu bra brb brd brg brr brt bru bta btb btd btg btr btt btu bua bub bud bug bur but buu daa dab dad dag dar dat dau dba dbb dbd dbg dbr dbt dbu dda ddb ddd ddg ddr ddt ddu dga dgd dgg dgr dgt dgu dra drb drd drg drr drt dru dta dtb dtd dtg dtr dtt dtu dua dub dud dug dur dut g-d gaa gab gad gag gar gat gau gba gbd gbg gbr gbt gbu gda gdb gdd gdr gdt gdu gga ggb ggd ggg ggr ggt ggu gra grb grd grg grr grt gru gta gtb gtd gtg gtr gtt gtu gu- gua gub gud gug gur gut guu ra- raa rab rad rag rar rat rau rba rbb rbd rbg rbr rbt rbu rda rdb rdd rdg rdr rdt rdu rga rgb rgd rgg rgr rgt rra rrb rrd rrg rrr rrt rru rta rtb rtd rtg rtr rtt rtu rua rub rud rug rur rut ruu taa tab tad tag tar tat tau tba tbb tbd tbg tbr tbt tbu tda tdb tdd tdg tdr tdt tdu tga tgb tgg tgr tgt tgu tra trb trd trg trr trt tru tta ttb ttd ttg ttr ttt ttu tua tub tud tug tur tut tuu ua- uaa uab uad uag uar uat uau uba ubb ubg ubr ubt ubu uda udb udd udg udr udt udu uga ugb ugg ugr ugt ugu ur- ura urb urd urg urr urt uru uta utb utd utr utt utu uua uug uur uut uuu