a-a a-b a-t aaa aab aag aak aan aao aar aat ab- aba abb abg abk abn abo abr abt ag- aga agb agg agk agn ago agr agt aka akb akg akk akn ako akr an- ana anb ang ank ann ano anr ant aoa aob aog aok aon aoo aor aot ar- ara arb arg ark arn aro arr art at- ata atb atg atn ato atr att baa bab bag bak ban bao bar bat bba bbb bbg bbk bbn bbo bbr bbt bga bgb bgg bgk bgn bgo bgr bgt bka bkb bkg bkk bkn bko bkr bkt bna bnb bng bnk bnn bno bnr bnt boa bob bog bok bon boo bor bot bra brb brg brk brn bro brr brt bta btb btg btk btn bto btr btt gaa gab gag gak gan gao gar gat gba gbg gbk gbn gbo gbr gbt gga ggb ggg ggn ggo ggr ggt gka gkb gkn gko gkt gna gnb gnn gno gnr gnt goa gob gog gok gon goo gor got gra grb grg grk grn gro grr grt gta gtb gtg gtk gtn gto gtr gtt k-t ka- kaa kab kag kak kan kao kar kat kba kbb kbk kbn kbo kbr kga kgb kgo kkb kkk kkn kkr kkt kn- kna kng knk knn kno knr knt koa kob kog kok kon koo kor kot kra krg krk krn kro krr krt kta ktb ktg ktk ktn kto ktr ktt naa nab nag nak nan nao nar nat nba nbb nbg nbk nbn nbo nbr nbt nga ngb ngg ngk ngn ngo ngt nka nkk nkn nko nkr nkt nna nnb nng nnk nnn nno nnt no- noa nob nog nok non noo nor not nra nrb nrg nrk nrn nro nrr nrt nta ntb ntg ntk ntn nto ntr ntt oaa oab oag oak oan oao oar oat ob- oba obb obg obk obn obo obr obt oga ogg ogn ogo ogt oka okb okg okk oko okr on- ona onb ong onk onn ono onr ont oo- ooa oob oog ook oon ooo oor oot or- ora orb org ork orn oro orr ort ot- ota otb otg otk otn oto otr ott ra- raa rab rag rak ran rao rar rat rba rbb rbg rbk rbn rbo rbr rbt rga rgb rgg rgk rgn rgo rgr rgt rkb rkg rkk rko rkt rna rnb rng rnn rno rnr rnt roa rob rog rok ron roo ror rot rra rrb rrg rrk rrn rrr rrt rta rtb rtg rtk rtn rto rtr rtt taa tab tag tak tan tao tar tat tba tbb tbg tbk tbn tbo tbr tbt tga tgb tgg tgk tgn tgo tgr tgt tka tkb tkg tkk tko tkr tkt tna tnb tng tnk tnn tno tnr tnt to- toa tob tog tok ton too tor tot tra trb trg trk trn tro trr trt tta ttb ttg ttk ttn tto ttr ttt