-er a-a a-b aaa aab aae aag aah aao aap aar aas ab- aba abb abe abg abh abo abp abr abs aea aeb aee aeg aeh aeo aep aer aes ag- aga agb age agg agh ago agp agr ags aha ahb ahe ahg ahh aho ahp ahr ahs aoa aob aoe aog aoh aoo aop aor aos ap- apa apb ape apg aph apo app apr aps ar- ara arb are arg arh aro arp arr ars as- asa asb ase asg ash aso asp asr ass b-p baa bab bae bag bah bao bap bar bas bba bbb bbe bbg bbh bbo bbp bbr bbs be- bea beb bee beg beh beo bep ber bes bga bgb bge bgg bgh bgo bgp bgr bgs bha bhb bhe bhg bhh bho bhp bhr bhs boa bob boe bog boh boo bop bor bos bpa bpb bpe bpg bph bpo bpp bpr bps bra brb bre brg brh bro brp brr brs bsa bsb bse bsg bsh bso bsp bsr bss eaa eab eae eag eah eao eap ear eas eba ebb ebe ebg ebh ebo ebp ebr ebs eea eeb eee eeg eeo eep eer ees ega egb ege egg egh ego egp egr egs eha ehb ehe ehg ehh eho ehp ehr ehs eo- eoa eob eoe eog eoh eoo eop eor eos ep- epa epb epe epg eph epo epp epr eps era erb ere erg erh ero erp err ers es- esa esb ese esg esh eso esp esr ess g-p gaa gab gae gag gah gao gap gar gas gba gbe gbg gbh gbo gbp gbr gbs ge- gea geb gee geg geh geo gep ger ges gga ggb ggg ggh ggo ggp ggr ggs gha ghb ghe ghg ghh gho ghp ghr ghs goa gob goe gog goh goo gop gor gos gpa gpb gpe gpg gph gpo gpp gpr gps gra grb gre grg grh gro grp grr grs gsa gsb gse gsg gso gsp gsr gss haa hab hae hag hah hao hap har has hba hbb hbe hbg hbh hbo hbp hbr hbs he- hea heb hee heg heh heo hep her hes hga hgb hge hgg hgh hgo hgp hgr hgs hha hhb hhe hhg hhh hho hhp hhr hhs hoa hob hoe hog hoh hoo hop hor hos hpa hpb hpe hpg hph hpo hpp hpr hps hr- hra hrb hre hrg hrh hro hrp hrr hrs hsa hsb hse hsg hsh hsp hsr hss oaa oab oae oag oah oao oap oar oas ob- oba obb obe obg obh obo obp obr obs oea oeb oee oeg oeh oeo oep oer oes oga oge ogg ogh ogo ogp ogs oha ohe ohg ohh oho ohp ohr ohs oo- ooa oob oog ooh ooo oop oor oos op- opa opb ope opg oph opo opp opr ops or- ora orb ore org orh oro orp orr ors os- osa osb ose osg osh oso osp osr oss p-p paa pab pae pag pah pao pap par pas pba pbb pbe pbg pbo pbp pbr pbs pea peb pee peg peh peo pep per pes pga pgb pge pgg pgh pgo pgp pgr pgs pha phb phe phg pho php phr phs poa pob poe pog poh poo pop por pos ppa ppb ppe ppg pph ppo ppp ppr pps pra prb pre prg prh pro prp prr prs ps- psa psb pse psg psh pso psp psr pss ra- raa rab rae rag rah rao rap rar ras rba rbb rbe rbg rbh rbo rbp rbr rbs re- rea reb ree reg reh reo rep rer res rga rgb rge rgg rgh rgo rgp rgr rgs rh- rha rhb rhe rhg rhh rho rhp rhr rhs roa rob roe rog roh roo rop ror ros rpa rpb rpe rpg rph rpo rpp rpr rps rra rrb rrg rrh rrp rrr rrs rsa rsb rse rsg rsh rso rsp rsr rss saa sab sae sag sah sao sap sar sas sba sbb sbe sbg sbh sbo sbp sbr sbs se- sea seb see seg seh seo sep ser ses sga sgb sge sgg sgh sgo sgp sgr sgs sh- sha shb she shg shh sho shp shr shs soa sob soe sog soh soo sop sor sos spa spb spe spg sph spo spp spr sps sr- sra srb sre srg srh sro srp srr srs ss- ssa ssb sse ssg ssh sso ssp ssr sss