a-a a-b a-t aaa aab aam aap aar aat ab- aba abb abm abp abr abt ama amb amm amp amr amt ap- apa apb apm app apr apt ar- ara arb arm arp arr art at- ata atb atm atp atr att b-p baa bab bam bap bar bat bba bbb bbm bbp bbr bbt bma bmb bmm bmp bmr bmt bpa bpb bpm bpp bpr bpt bra brb brm brp brr brt bta btb btm btp btr btt m-r maa mab mam map mar mat mba mbb mbm mbp mbr mbt mma mmb mmm mmp mmr mmt mpa mpb mpm mpp mpr mpt mra mrb mrm mrp mrr mrt mta mtb mtm mtp mtr mtt p-p paa pab pam pap par pat pba pbb pbm pbp pbr pbt pma pmb pmm pmp pmr pmt ppa ppb ppm ppp ppr ppt pra prb prm prp prr prt pt- pta ptb ptm ptp ptr ptt ra- raa rab ram rap rar rat rba rbb rbm rbp rbr rbt rma rmb rmm rmp rmr rmt rpa rpb rpm rpp rpr rpt rra rrb rrm rrp rrr rrt rta rtb rtm rtp rtr rtt taa tab tam tap tar tat tba tbb tbm tbp tbr tbt tma tmb tmm tmp tmr tmt tpa tpb tpm tpp tpr tpt tra trb trm trp trr trt tta ttb ttm ttp ttr ttt