a-a a-b a-t aaa aab aad aan aap aar aat ab- aba abb abd abn abp abr abt ad- ada adb add adn adp adr adt an- ana anb and ann anp anr ant ap- apa apb apd apn app apr apt ar- ara arb ard arn arp arr art at- ata atb atd atn atp atr att b-p baa bab bad ban bap bar bat bba bbb bbd bbn bbp bbr bbt bda bdb bdd bdp bdr bdt bna bnb bnd bnn bnp bnr bnt bpa bpb bpd bpn bpp bpr bpt bra brb brd brn brp brr brt bta btb btd btn btp btr btt daa dab dad dan dap dar dat dba dbb dbd dbn dbp dbr dbt dda ddb ddd ddn ddp ddr ddt dna dnb dnd dnn dnp dnr dnt dpa dpb dpd dpn dpp dpr dpt dra drb drd drn drp drr drt dta dtb dtd dtn dtp dtr dtt naa nab nad nan nap nar nat nba nbb nbd nbn nbp nbr nbt nda ndb ndd ndn ndp ndr ndt nna nnb nnn nnp nnt npa npb npd npn npp npr npt nra nrb nrd nrn nrp nrr nrt nta ntb ntd ntn ntp ntr ntt p-p paa pab pad pan pap par pat pba pbb pbd pbn pbp pbr pbt pda pdb pdd pdn pdp pdr pdt pn- pna pnb pnd pnn pnp pnr pnt ppa ppb ppd ppn ppp ppr ppt pra prb prd prn prp prr prt pt- pta ptb ptd ptn ptp ptr ptt ra- raa rab rad ran rap rar rat rba rbb rbd rbn rbp rbr rbt rda rdb rdd rdn rdp rdr rdt rna rnb rnd rnn rnp rnr rnt rpa rpb rpd rpn rpp rpr rpt rra rrb rrd rrn rrp rrr rrt rta rtb rtd rtn rtp rtr rtt taa tab tad tan tap tar tat tba tbb tbd tbn tbp tbr tbt tda tdb tdd tdn tdp tdr tdt tna tnb tnd tnn tnp tnr tnt tpa tpb tpd tpn tpp tpr tpt tra trb trd trn trp trr trt tta ttb ttd ttn ttp ttr ttt