a-a a-b aaa aab aad aag aan aar aau ab- aba abb abd abg abn abr abu ad- ada adb add adg adn adr adu ag- aga agb agd agg agn agr agu an- ana anb and ang ann anr anu ar- ara arb ard arg arn arr aru au- aua aub aud aug aun aur b-u baa bab bad bag ban bar bau bba bbb bbd bbg bbn bbr bbu bda bdb bdd bdg bdr bdu bga bgb bgd bgg bgn bgr bgu bna bnb bnd bng bnn bnr bnu bra brb brd brg brn brr bru bua bub bud bug bun bur buu daa dab dad dag dan dar dau dba dbb dbd dbg dbn dbr dbu dda ddb ddd ddg ddn ddr ddu dga dgd dgg dgn dgr dgu dna dnb dnd dng dnn dnr dra drb drd drg drn drr dru dua dub dud dug dun dur g-d gaa gab gad gag gan gar gau gba gbd gbg gbn gbr gbu gda gdb gdd gdn gdr gdu gga ggb ggd ggg ggn ggr ggu gna gnb gnd gnn gnr gnu gra grb grd grg grn grr gru gu- gua gub gud gug gun gur guu naa nab nad nag nan nar nau nba nbb nbd nbg nbn nbr nbu nda ndb ndd ndg ndn ndr ndu nga ngb ngd ngg ngn ngu nna nnb nng nnn nnu nra nrb nrd nrg nrn nrr nru nua nub nud nug nun nur nuu ra- raa rab rad rag ran rar rau rba rbb rbd rbg rbn rbr rbu rda rdb rdd rdg rdn rdr rdu rga rgb rgd rgg rgn rgr rna rnb rnd rng rnn rnr rnu rra rrb rrd rrg rrn rrr rru rua rub rud rug run rur ruu ua- uaa uab uad uag uan uar uau uba ubb ubg ubn ubr ubu uda udb udd udg udn udr udu uga ugb ugg ugn ugr ugu un- una unb und ung unn unr unu ur- ura urb urd urg urn urr uru uua uug uun uur uuu