a-a a-b aaa aab aad aag aak aan aao aar ab- aba abb abd abg abk abn abo abr ad- ada adb add adg adk adn ado adr ag- aga agb agd agg agk agn ago agr aka akb akd akg akk akn ako akr an- ana anb and ang ank ann ano anr aoa aob aod aog aok aon aoo aor ar- ara arb ard arg ark arn aro arr baa bab bad bag bak ban bao bar bba bbb bbd bbg bbk bbn bbo bbr bda bdb bdd bdg bdk bdo bdr bga bgb bgd bgg bgk bgn bgo bgr bka bkb bkg bkk bkn bko bkr bna bnb bnd bng bnk bnn bno bnr boa bob bod bog bok bon boo bor bra brb brd brg brk brn bro brr daa dab dad dag dak dan dao dar dba dbb dbd dbg dbk dbn dbo dbr dda ddb ddd ddg ddk ddn ddo ddr dga dgd dgg dgk dgn dgr dka dkb dkg dkk dko dkr dna dnb dnd dng dnk dnn dno dnr doa dob dod dog dok don doo dor dra drb drd drg drk drn dro drr g-d gaa gab gad gag gak gan gao gar gba gbd gbg gbk gbn gbo gbr gda gdb gdd gdk gdn gdo gdr gga ggb ggd ggg ggn ggo ggr gka gkb gkd gkn gko gna gnb gnd gnn gno gnr goa gob god gog gok gon goo gor gra grb grd grg grk grn gro grr ka- kaa kab kad kag kak kan kao kar kba kbb kbd kbk kbn kbo kbr kda kdb kdg kdk kdo kdr kga kgb kgd kgo kkb kkk kkn kkr kn- kna knd kng knk knn kno knr koa kob kod kog kok kon koo kor kra krd krg krk krn kro krr naa nab nad nag nak nan nao nar nba nbb nbd nbg nbk nbn nbo nbr nda ndb ndd ndg ndk ndn ndo ndr nga ngb ngd ngg ngk ngn ngo nka nkk nkn nko nkr nna nnb nng nnk nnn nno no- noa nob nod nog nok non noo nor nra nrb nrd nrg nrk nrn nro nrr oaa oab oad oag oak oan oao oar ob- oba obb obd obg obk obn obo obr oda odb odd odg odn odo odr oga ogd ogg ogn ogo oka okb okd okg okk oko okr on- ona onb ond ong onk onn ono onr oo- ooa oob ood oog ook oon ooo oor or- ora orb ord org ork orn oro orr ra- raa rab rad rag rak ran rao rar rba rbb rbd rbg rbk rbn rbo rbr rda rdb rdd rdg rdn rdo rdr rga rgb rgd rgg rgk rgn rgo rgr rkb rkg rkk rko rna rnb rnd rng rnn rno rnr roa rob rod rog rok ron roo ror rra rrb rrd rrg rrk rrn rrr