-er a-a a-b a-c aaa aab aac aad aae aag aao aap aar aas ab- aba abb abc abd abe abg abo abp abr abs ac- aca acb acc acd ace acg aco acp acr acs ad- ada adb adc add ade adg ado adp adr ads aea aeb aec aed aee aeg aeo aep aer aes ag- aga agb agc agd age agg ago agp agr ags aoa aob aoc aod aoe aog aoo aop aor aos ap- apa apb apc apd ape apg apo app apr aps ar- ara arb arc ard are arg aro arp arr ars as- asa asb asc asd ase asg aso asp asr ass b-p baa bab bac bad bae bag bao bap bar bas bba bbb bbc bbd bbe bbg bbo bbp bbr bbs bca bcb bcc bcd bce bcg bco bcp bcr bcs bda bdb bdc bdd bde bdg bdo bdp bdr bds be- bea beb bec bed bee beg beo bep ber bes bga bgb bgc bgd bge bgg bgo bgp bgr bgs boa bob boc bod boe bog boo bop bor bos bpa bpb bpc bpd bpe bpg bpo bpp bpr bps bra brb brd bre brg bro brp brr brs bsa bsb bsc bsd bse bsg bso bsp bsr bss c-- caa cab cac cad cae cag cao cap car cas cba cbb cbc cbd cbe cbg cbo cbp cbr cbs cca ccb ccc ccd cce ccg cco ccp ccr ccs cda cdb cdc cdd cde cdg cdo cdp cdr cds ce- cea ceb cec ced cee ceg ceo cep cer ces cga cgb cgc cgd cge cgg cgo cgp cgr cgs co- coa cob coc cod coe cog coo cop cor cos cpa cpb cpc cpd cpe cpg cpo cpp cpr cps cra crb crc crd cre crg cro crp crr crs csa csb csc csd cse csg cso csp csr css daa dab dac dad dae dag dao dap dar das dba dbb dbc dbd dbe dbg dbo dbp dbr dbs dca dcb dcc dcd dce dcg dco dcp dcr dcs dda ddb ddc ddd dde ddg ddo ddp ddr dds de- dea deb dec ded dee deg deo dep der des dga dgc dgd dge dgg dgp dgr dgs doa dob doc dod doe dog doo dop dor dos dpa dpb dpc dpd dpe dpg dpo dpp dpr dps dra drb drc drd dre drg dro drp drr drs dsa dsb dsc dsd dse dsg dso dsp dsr dss eaa eab eac ead eae eag eao eap ear eas eba ebb ebc ebd ebe ebg ebo ebp ebr ebs ec- eca ecb ecc ecd ece ecg eco ecr ecs ed- eda edb edc edd ede edg edo edp edr eds eea eeb eec eed eee eeg eeo eep eer ees ega egb egc egd ege egg ego egp egr egs eo- eoa eob eoc eod eoe eog eoo eop eor eos ep- epa epb epc epd epe epg epo epp epr eps era erb erc erd ere erg ero erp err ers es- esa esb esc esd ese esg eso esp esr ess g-d g-p gaa gab gac gad gae gag gao gap gar gas gba gbc gbd gbe gbg gbo gbp gbr gbs gca gcb gcc gcd gce gcg gco gcp gcr gcs gda gdb gdc gdd gde gdo gdp gdr gds ge- gea geb gec ged gee geg geo gep ger ges gga ggb ggc ggd ggg ggo ggp ggr ggs goa gob goc god goe gog goo gop gor gos gpa gpb gpc gpd gpe gpg gpo gpp gpr gps gra grb grc grd gre grg gro grp grr grs gsa gsb gsc gsd gse gsg gso gsp gsr gss oaa oab oac oad oae oag oao oap oar oas ob- oba obb obc obd obe obg obo obp obr obs oc- oca ocb occ ocd ocg oco ocp ocr ocs oda odb odc odd ode odg odo odp odr ods oea oeb oec oed oee oeg oeo oep oer oes oga ogc ogd oge ogg ogo ogp ogs oo- ooa oob ooc ood oog ooo oop oor oos op- opa opb opc opd ope opg opo opp opr ops or- ora orb orc ord ore org oro orp orr ors os- osa osb osc osd ose osg oso osp osr oss p-p paa pab pac pad pae pag pao pap par pas pba pbb pbc pbd pbe pbg pbo pbp pbr pbs pca pcb pcc pcd pce pcg pco pcp pcr pcs pda pdb pdc pdd pde pdg pdo pdp pdr pds pea peb pec ped pee peg peo pep per pes pga pgb pgc pgd pge pgg pgo pgp pgr pgs poa pob poc pod poe pog poo pop por pos ppa ppb ppc ppd ppe ppg ppo ppp ppr pps pra prb prc prd pre prg pro prp prr prs ps- psa psb psc psd pse psg pso psp psr pss ra- raa rab rac rad rae rag rao rap rar ras rba rbb rbc rbd rbe rbg rbo rbp rbr rbs rca rcb rcc rcd rce rcg rco rcp rcr rcs rda rdb rdc rdd rde rdg rdo rdp rdr rds re- rea reb rec red ree reg reo rep rer res rga rgb rgc rgd rge rgg rgo rgp rgr rgs roa rob roc rod roe rog roo rop ror ros rpa rpb rpc rpd rpe rpg rpo rpp rpr rps rra rrb rrc rrd rrg rrp rrr rrs rsa rsb rsc rsd rse rsg rso rsp rsr rss saa sab sac sad sae sag sao sap sar sas sba sbb sbc sbd sbe sbg sbo sbp sbr sbs sca scb scc scd sce scg sco scp scr scs sda sdb sdc sdd sde sdg sdo sdp sdr sds se- sea seb sec sed see seg seo sep ser ses sga sgb sgc sgd sge sgg sgo sgp sgr sgs soa sob soc sod soe sog soo sop sor sos spa spb spc spd spe spg spo