a-a a-b a-t aaa aab aam aan aao aar aat ab- aba abb abm abn abo abr abt ama amb amm amn amo amr amt an- ana anb anm ann ano anr ant aoa aob aom aon aoo aor aot ar- ara arb arm arn aro arr art at- ata atb atm atn ato atr att baa bab bam ban bao bar bat bba bbb bbm bbn bbo bbr bbt bma bmb bmm bmn bmo bmr bmt bna bnb bnn bno bnr bnt boa bob bom bon boo bor bot bra brb brm brn bro brr brt bta btb btm btn bto btr btt m-o m-r maa mab mam man mao mar mat mba mbb mbm mbo mbr mbt mma mmb mmm mmn mmo mmr mmt mna mnb mnm mnn mno mnr mnt moa mob mom mon moo mor mot mra mrb mrm mrn mro mrr mrt mta mtb mtm mtn mto mtr mtt naa nab nam nan nao nar nat nba nbb nbm nbn nbo nbr nbt nma nmb nmm nmn nmo nmr nmt nna nnb nnm nnn nno nnt no- noa nob nom non noo nor not nra nrb nrm nrn nro nrr nrt nta ntb ntm ntn nto ntr ntt oaa oab oam oan oao oar oat ob- oba obb obm obn obo obr obt om- oma omb omm omn omo omr omt on- ona onb onn ono onr ont oo- ooa oob oom oon ooo oor oot or- ora orb orm orn oro orr ort ot- ota otb otm otn oto otr ott ra- raa rab ram ran rao rar rat rba rbb rbm rbn rbo rbr rbt rma rmb rmm rmn rmo rmr rmt rna rnb rnm rnn rno rnr rnt roa rob rom ron roo ror rot rra rrb rrm rrn rrr rrt rta rtb rtm rtn rto rtr rtt taa tab tam tan tao tar tat tba tbb tbm tbn tbo tbr tbt tma tmb tmm tmn tmo tmr tmt tna tnb tnm tnn tno tnr tnt to- toa tob tom ton too tor tot tra trb trm trn tro trr trt tta ttb ttm ttn tto ttr ttt