a-a a-b a-t aaa aab aad aap aar aat ab- aba abb abd abp abr abt ad- ada adb add adp adr adt ap- apa apb apd app apr apt ar- ara arb ard arp arr art at- ata atb atd atp atr att b-p baa bab bad bap bar bat bba bbb bbd bbp bbr bbt bda bdb bdd bdp bdr bdt bpa bpb bpd bpp bpr bpt bra brb brd brp brr brt bta btb btd btp btr btt daa dab dad dap dar dat dba dbb dbd dbp dbr dbt dda ddb ddd ddp ddr ddt dpa dpb dpd dpp dpr dpt dra drb drd drp drr drt dta dtb dtd dtp dtr dtt p-p paa pab pad pap par pat pba pbb pbd pbp pbr pbt pda pdb pdd pdp pdr pdt ppa ppb ppd ppp ppr ppt pra prb prd prp prr prt pt- pta ptb ptd ptp ptr ptt ra- raa rab rad rap rar rat rba rbb rbd rbp rbr rbt rda rdb rdd rdp rdr rdt rpa rpb rpd rpp rpr rpt rra rrb rrd rrp rrr rrt rta rtb rtd rtp rtr rtt taa tab tad tap tar tat tba tbb tbd tbp tbr tbt tda tdb tdd tdp tdr tdt tpa tpb tpd tpp tpr tpt tra trb trd trp trr trt tta ttb ttd ttp ttr ttt