-er a-a a-b a-t aaa aab aad aae aag aap aar aat ab- aba abb abd abe abg abp abr abt ad- ada adb add ade adg adp adr adt aea aeb aed aee aeg aep aer aet ag- aga agb agd age agg agp agr agt ap- apa apb apd ape apg app apr apt ar- ara arb ard are arg arp arr art at- ata atb atd ate atg atp atr att b-p baa bab bad bae bag bap bar bat bba bbb bbd bbe bbg bbp bbr bbt bda bdb bdd bde bdg bdp bdr bdt be- bea beb bed bee beg bep ber bet bga bgb bgd bge bgg bgp bgr bgt bpa bpb bpd bpe bpg bpp bpr bpt bra brb brd bre brg brp brr brt bta btb btd bte btg btp btr btt daa dab dad dae dag dap dar dat dba dbb dbd dbe dbg dbp dbr dbt dda ddb ddd dde ddg ddp ddr ddt de- dea deb ded dee deg dep der det dga dgd dge dgg dgp dgr dgt dpa dpb dpd dpe dpg dpp dpr dpt dra drb drd dre drg drp drr drt dta dtb dtd dte dtg dtp dtr dtt eaa eab ead eae eag eap ear eat eba ebb ebd ebe ebg ebp ebr ebt ed- eda edb edd ede edg edp edr edt eea eeb eed eee eeg eep eer eet ega egb egd ege egg egp egr egt ep- epa epb epd epe epg epp epr ept era erb erd ere erg erp err ert eta etb etd ete etg etp etr ett g-d g-p gaa gab gad gae gag gap gar gat gba gbd gbe gbg gbp gbr gbt gda gdb gdd gde gdp gdr gdt ge- gea geb ged gee geg gep ger get gga ggb ggd ggg ggp ggr ggt gpa gpb gpd gpe gpg gpp gpr gpt gra grb grd gre grg grp grr grt gta gtb gtd gte gtg gtp gtr gtt p-p paa pab pad pae pag pap par pat pba pbb pbd pbe pbg pbp pbr pbt pda pdb pdd pde pdg pdp pdr pdt pea peb ped pee peg pep per pet pga pgb pgd pge pgg pgp pgr pgt ppa ppb ppd ppe ppg ppp ppr ppt pra prb prd pre prg prp prr prt pt- pta ptb ptd pte ptg ptp ptr ptt ra- raa rab rad rae rag rap rar rat rba rbb rbd rbe rbg rbp rbr rbt rda rdb rdd rde rdg rdp rdr rdt re- rea reb red ree reg rep rer ret rga rgb rgd rge rgg rgp rgr rgt rpa rpb rpd rpe rpg rpp rpr rpt rra rrb rrd rrg rrp rrr rrt rta rtb rtd rte rtg rtp rtr rtt taa tab tad tae tag tap tar tat tba tbb tbd tbe tbg tbp tbr tbt tda tdb tdd tde tdg tdp tdr tdt te- tea teb ted tee teg tep ter tet tga tgb tge tgg tgp tgr tgt tpa tpb tpd tpe tpg tpp tpr tpt tra trb trd tre trg trp trr trt tta ttb ttd tte ttg ttp ttr ttt