-er a-a a-b a-t aaa aab aae aag aao aap aar aat ab- aba abb abe abg abo abp abr abt aea aeb aee aeg aeo aep aer aet ag- aga agb age agg ago agp agr agt aoa aob aoe aog aoo aop aor aot ap- apa apb ape apg apo app apr apt ar- ara arb are arg aro arp arr art at- ata atb ate atg ato atp atr att b-p baa bab bae bag bao bap bar bat bba bbb bbe bbg bbo bbp bbr bbt be- bea beb bee beg beo bep ber bet bga bgb bge bgg bgo bgp bgr bgt boa bob boe bog boo bop bor bot bpa bpb bpe bpg bpo bpp bpr bpt bra brb bre brg bro brp brr brt bta btb bte btg bto btp btr btt eaa eab eae eag eao eap ear eat eba ebb ebe ebg ebo ebp ebr ebt eea eeb eee eeg eeo eep eer eet ega egb ege egg ego egp egr egt eo- eoa eob eoe eog eoo eop eor eot ep- epa epb epe epg epo epp epr ept era erb ere erg ero erp err ert eta etb ete etg eto etp etr ett g-p gaa gab gae gag gao gap gar gat gba gbe gbg gbo gbp gbr gbt ge- gea geb gee geg geo gep ger get gga ggb ggg ggo ggp ggr ggt goa gob goe gog goo gop gor got gpa gpb gpe gpg gpo gpp gpr gpt gra grb gre grg gro grp grr grt gta gtb gte gtg gto gtp gtr gtt oaa oab oae oag oao oap oar oat ob- oba obb obe obg obo obp obr obt oea oeb oee oeg oeo oep oer oet oga oge ogg ogo ogp ogt oo- ooa oob oog ooo oop oor oot op- opa opb ope opg opo opp opr opt or- ora orb ore org oro orp orr ort ot- ota otb ote otg oto otp otr ott p-p paa pab pae pag pao pap par pat pba pbb pbe pbg pbo pbp pbr pbt pea peb pee peg peo pep per pet pga pgb pge pgg pgo pgp pgr pgt poa pob poe pog poo pop por pot ppa ppb ppe ppg ppo ppp ppr ppt pra prb pre prg pro prp prr prt pt- pta ptb pte ptg pto ptp ptr ptt ra- raa rab rae rag rao rap rar rat rba rbb rbe rbg rbo rbp rbr rbt re- rea reb ree reg reo rep rer ret rga rgb rge rgg rgo rgp rgr rgt roa rob roe rog roo rop ror rot rpa rpb rpe rpg rpo rpp rpr rpt rra rrb rrg rrp rrr rrt rta rtb rte rtg rto rtp rtr rtt taa tab tae tag tao tap tar tat tba tbb tbe tbg tbo tbp tbr tbt te- tea teb tee teg teo tep ter tet tga tgb tge tgg tgo tgp tgr tgt to- toa tob toe tog too top tor tot tpa tpb tpe tpg tpo tpp tpr tpt tra trb tre trg tro trp trr trt tta ttb tte ttg tto ttp ttr ttt