a-a a-b a-t aaa aab aam aao aap aar aat ab- aba abb abm abo abp abr abt ama amb amm amo amp amr amt aoa aob aom aoo aop aor aot ap- apa apb apm apo app apr apt ar- ara arb arm aro arp arr art at- ata atb atm ato atp atr att b-p baa bab bam bao bap bar bat bba bbb bbm bbo bbp bbr bbt bma bmb bmm bmo bmp bmr bmt boa bob bom boo bop bor bot bpa bpb bpm bpo bpp bpr bpt bra brb brm bro brp brr brt bta btb btm bto btp btr btt m-o m-r maa mab mam mao map mar mat mba mbb mbm mbo mbp mbr mbt mma mmb mmm mmo mmp mmr mmt moa mob mom moo mop mor mot mpa mpb mpm mpo mpp mpr mpt mra mrb mrm mro mrp mrr mrt mta mtb mtm mto mtp mtr mtt oaa oab oam oao oap oar oat ob- oba obb obm obo obp obr obt om- oma omb omm omo omp omr omt oo- ooa oob oom ooo oop oor oot op- opa opb opm opo opp opr opt or- ora orb orm oro orp orr ort ot- ota otb otm oto otp otr ott p-p paa pab pam pao pap par pat pba pbb pbm pbo pbp pbr pbt pma pmb pmm pmo pmp pmr pmt poa pob pom poo pop por pot ppa ppb ppm ppo ppp ppr ppt pra prb prm pro prp prr prt pt- pta ptb ptm pto ptp ptr ptt ra- raa rab ram rao rap rar rat rba rbb rbm rbo rbp rbr rbt rma rmb rmm rmo rmp rmr rmt roa rob rom roo rop ror rot rpa rpb rpm rpo rpp rpr rpt rra rrb rrm rrp rrr rrt rta rtb rtm rto rtp rtr rtt taa tab tam tao tap tar tat tba tbb tbm tbo tbp tbr tbt tma tmb tmm tmo tmp tmr tmt to- toa tob tom too top tor tot tpa tpb tpm tpo tpp tpr tpt tra trb trm tro trp trr trt tta ttb ttm tto ttp ttr ttt