-er a-a a-b a-t aaa aab aad aae aan aap aar aat ab- aba abb abd abe abn abp abr abt ad- ada adb add ade adn adp adr adt aea aeb aed aee aen aep aer aet an- ana anb and ane ann anp anr ant ap- apa apb apd ape apn app apr apt ar- ara arb ard are arn arp arr art at- ata atb atd ate atn atp atr att b-p baa bab bad bae ban bap bar bat bba bbb bbd bbe bbn bbp bbr bbt bda bdb bdd bde bdp bdr bdt be- bea beb bed bee ben bep ber bet bna bnb bnd bne bnn bnp bnr bnt bpa bpb bpd bpe bpn bpp bpr bpt bra brb brd bre brn brp brr brt bta btb btd bte btn btp btr btt daa dab dad dae dan dap dar dat dba dbb dbd dbe dbn dbp dbr dbt dda ddb ddd dde ddn ddp ddr ddt de- dea deb ded dee den dep der det dna dnb dnd dne dnn dnp dnr dnt dpa dpb dpd dpe dpn dpp dpr dpt dra drb drd dre drn drp drr drt dta dtb dtd dte dtn dtp dtr dtt eaa eab ead eae ean eap ear eat eba ebb ebd ebe ebn ebp ebr ebt ed- eda edb edd ede edn edp edr edt eea eeb eed eee een eep eer eet en- ena enb end ene enn enp enr ent ep- epa epb epd epe epn epp epr ept era erb erd ere ern erp err ert eta etb etd ete etn etp etr ett naa nab nad nae nan nap nar nat nba nbb nbd nbe nbn nbp nbr nbt nda ndb ndd nde ndn ndp ndr ndt ne- nea neb ned nee nen nep ner net nna nnb nne nnn nnp nnt npa npb npd npe npn npp npr npt nra nrb nrd nre nrn nrp nrr nrt nta ntb ntd nte ntn ntp ntr ntt p-p paa pab pad pae pan pap par pat pba pbb pbd pbe pbn pbp pbr pbt pda pdb pdd pde pdn pdp pdr pdt pea peb ped pee pen pep per pet pn- pna pnb pnd pne pnn pnp pnr pnt ppa ppb ppd ppe ppn ppp ppr ppt pra prb prd pre prn prp prr prt pt- pta ptb ptd pte ptn ptp ptr ptt ra- raa rab rad rae ran rap rar rat rba rbb rbd rbe rbn rbp rbr rbt rda rdb rdd rde rdn rdp rdr rdt re- rea reb red ree ren rep rer ret rna rnb rnd rnn rnp rnr rnt rpa rpb rpd rpe rpn rpp rpr rpt rra rrb rrd rrn rrp rrr rrt rta rtb rtd rte rtn rtp rtr rtt taa tab tad tae tan tap tar tat tba tbb tbd tbe tbn tbp tbr tbt tda tdb tdd tde tdn tdp tdr tdt te- tea teb ted tee ten tep ter tet tna tnb tnd tne tnn tnp tnr tnt tpa tpb tpd tpe tpn tpp tpr tpt tra trb trd tre trn trp trr trt tta ttb ttd tte ttn ttp ttr ttt