-er a-a a-b a-t aaa aab aae aag aap aar aat ab- aba abb abe abg abp abr abt aea aeb aee aeg aep aer aet ag- aga agb age agg agp agr agt ap- apa apb ape apg app apr apt ar- ara arb are arg arp arr art at- ata atb ate atg atp atr att b-p baa bab bae bag bap bar bat bba bbb bbe bbg bbp bbr bbt be- bea beb bee beg bep ber bet bga bgb bge bgg bgp bgr bgt bpa bpb bpe bpg bpp bpr bpt bra brb bre brg brp brr brt bta btb bte btg btp btr btt eaa eab eae eag eap ear eat eba ebb ebe ebg ebp ebr ebt eea eeb eee eeg eep eer eet ega egb ege egg egp egr egt ep- epa epb epe epg epp epr ept era erb ere erg erp err ert eta etb ete etg etp etr ett g-p gaa gab gae gag gap gar gat gba gbe gbg gbp gbr gbt ge- gea geb gee geg gep ger get gga ggb ggg ggp ggr ggt gpa gpb gpe gpg gpp gpr gpt gra grb gre grg grp grr grt gta gtb gte gtg gtp gtr gtt p-p paa pab pae pag pap par pat pba pbb pbe pbg pbp pbr pbt pea peb pee peg pep per pet pga pgb pge pgg pgp pgr pgt ppa ppb ppe ppg ppp ppr ppt pra prb pre prg prp prr prt pt- pta ptb pte ptg ptp ptr ptt ra- raa rab rae rag rap rar rat rba rbb rbe rbg rbp rbr rbt re- rea reb ree reg rep rer ret rga rgb rge rgg rgp rgr rgt rpa rpb rpe rpg rpp rpr rpt rra rrb rrg rrp rrr rrt rta rtb rte rtg rtp rtr rtt taa tab tae tag tap tar tat tba tbb tbe tbg tbp tbr tbt te- tea teb tee teg tep ter tet tga tgb tge tgg tgp tgr tgt tpa tpb tpe tpg tpp tpr tpt tra trb tre trg trp trr trt tta ttb tte ttg ttp ttr ttt