a-a a-b aaa aab aad aaf aag aah aar aau ab- aba abb abd abf abg abh abr abu ad- ada adb add adf adg adh adr adu af- afa afb afd aff afg afh afr afu ag- aga agb agd agf agg agh agr agu aha ahb ahd ahf ahg ahh ahr ahu ar- ara arb ard arf arg arh arr aru au- aua aub aud auf aug auh aur b-u baa bab bad baf bag bah bar bau bba bbb bbd bbf bbg bbh bbr bbu bda bdb bdd bdf bdg bdh bdr bdu bfa bfb bfd bff bfg bfh bfr bfu bga bgb bgd bgf bgg bgh bgr bgu bha bhb bhd bhf bhg bhh bhr bhu bra brb brd brf brg brh brr bru bua bub bud buf bug buh bur buu daa dab dad daf dag dah dar dau dba dbb dbd dbf dbg dbh dbr dbu dda ddb ddd ddf ddg ddh ddr ddu dfa dfb dfd dff dfg dfh dfr dfu dga dgd dgf dgg dgh dgr dgu dh- dha dhb dhd dhf dhh dhr dhu dra drb drd drg drr dru dua dub dud duf dug duh dur faa fab fad faf fag fah far fau fba fbb fbd fbf fbg fbh fbr fbu fda fdb fdd fdf fdg fdh fdr fdu ffa ffd fff ffg ffh ffr ffu fga fgb fgd fgf fgg fgh fgr fha fhb fhf fhg fhh fhr fra frb frd frf frg frh frr fru fua fub fud fuf fug fur fuu g-d gaa gab gad gaf gag gah gar gau gba gbd gbf gbg gbh gbr gbu gda gdb gdd gdf gdh gdr gdu gfa gfb gfd gff gfh gfr gga ggb ggd ggg ggh ggr ggu gha ghb ghd ghg ghh ghr gra grb grd grf grg grh grr gru gu- gua gub gud guf gug gur guu haa hab had haf hag hah har hau hba hbb hbd hbf hbg hbh hbr hbu hda hdb hdd hdf hdg hdh hdr hdu hfa hfb hfd hff hfg hfh hfr hfu hga hgb hgf hgg hgh hgr hgu hha hhb hhd hhf hhg hhh hhr hhu hr- hra hrb hrd hrf hrg hrh hrr hru hua hub hud huf hug huh hur huu ra- raa rab rad raf rag rah rar rau rba rbb rbd rbf rbg rbh rbr rbu rda rdb rdd rdf rdg rdh rdr rdu rfa rfb rfd rff rfg rfh rfr rfu rga rgb rgd rgf rgg rgh rgr rh- rha rhb rhd rhf rhg rhh rhr rhu rra rrb rrd rrf rrg rrh rrr rru rua rub rud ruf rug ruh rur ruu ua- uaa uab uad uaf uag uah uar uau uba ubb ubf ubg ubh ubr ubu uda udb udd udf udg udr udu ufa ufd uff ufg ufh ufr ufu uga ugb ugf ugg ugh ugr ugu uha uhb uhd uhf uhh uhr uhu ur- ura urb urd urf urg urr uru uua uug uur uuu