-er a-a a-b a-c aaa aab aac aae aah aao aap aar aas ab- aba abb abc abe abh abo abp abr abs ac- aca acb acc ace ach aco acp acr acs aea aeb aec aee aeh aeo aep aer aes aha ahb ahc ahe ahh aho ahp ahr ahs aoa aob aoc aoe aoh aoo aop aor aos ap- apa apb apc ape aph apo app apr aps ar- ara arb arc are arh aro arp arr ars as- asa asb asc ase ash aso asp asr ass b-p baa bab bac bae bah bao bap bar bas bba bbb bbc bbe bbh bbo bbp bbr bbs bca bcb bcc bce bch bco bcp bcr bcs be- bea beb bec bee beh beo bep ber bes bha bhb bhc bhe bhh bho bhp bhr bhs boa bob boc boe boh boo bop bor bos bpa bpb bpc bpe bph bpo bpp bpr bps bra brb bre brh bro brp brr brs bsa bsb bsc bse bsh bso bsp bsr bss c-- caa cab cac cae cah cao cap car cas cba cbb cbc cbe cbh cbo cbp cbr cbs cca ccb ccc cce cch cco ccp ccr ccs ce- cea ceb cec cee ceh ceo cep cer ces ch- cha chb chc che chh cho chp chr chs co- coa cob coc coe coh coo cop cor cos cpa cpb cpc cpe cph cpo cpp cpr cps cra crb crc cre crh cro crp crr crs csa csb csc cse csh cso csp csr css eaa eab eac eae eah eao eap ear eas eba ebb ebc ebe ebh ebo ebp ebr ebs ec- eca ecb ecc ece ech eco ecr ecs eea eeb eec eee eeo eep eer ees eha ehb ehc ehe ehh eho ehp ehr ehs eo- eoa eob eoc eoe eoh eoo eop eor eos ep- epa epb epc epe eph epo epp epr eps era erb erc ere erh ero erp err ers es- esa esb esc ese esh eso esp esr ess haa hab hac hae hah hao hap har has hba hbb hbc hbe hbh hbo hbp hbr hbs hca hcb hcc hce hch hco hcp hcr hcs he- hea heb hec hee heh heo hep her hes hha hhb hhc hhe hhh hho hhp hhr hhs hoa hob hoc hoe hoh hoo hop hor hos hpa hpb hpc hpe hph hpo hpp hpr hps hr- hra hrb hrc hre hrh hro hrp hrr hrs hsa hsb hsc hse hsh hsp hsr hss oaa oab oac oae oah oao oap oar oas ob- oba obb obc obe obh obo obp obr obs oc- oca ocb occ och oco ocp ocr ocs oea oeb oec oee oeh oeo oep oer oes oha ohc ohe ohh oho ohp ohr ohs oo- ooa oob ooc ooh ooo oop oor oos op- opa opb opc ope oph opo opp opr ops or- ora orb orc ore orh oro orp orr ors os- osa osb osc ose osh oso osp osr oss p-p paa pab pac pae pah pao pap par pas pba pbb pbc pbe pbo pbp pbr pbs pca pcb pcc pce pch pco pcp pcr pcs pea peb pec pee peh peo pep per pes pha phb phc phe pho php phr phs poa pob poc poe poh poo pop por pos ppa ppb ppc ppe pph ppo ppp ppr pps pra prb prc pre prh pro prp prr prs ps- psa psb psc pse psh pso psp psr pss ra- raa rab rac rae rah rao rap rar ras rba rbb rbc rbe rbh rbo rbp rbr rbs rca rcb rcc rce rch rco rcp rcr rcs re- rea reb rec ree reh reo rep rer res rh- rha rhb rhc rhe rhh rho rhp rhr rhs roa rob roc roe roh roo rop ror ros rpa rpb rpc rpe rph rpo rpp rpr rps rra rrb rrc rrh rrp rrr rrs rsa rsb rsc rse rsh rso rsp rsr rss saa sab sac sae sah sao sap sar sas sba sbb sbc sbe sbh sbo sbp sbr sbs sca scb scc sce sch sco scp scr scs se- sea seb sec see seh seo sep ser ses sh- sha shb shc she shh sho shp shr shs soa sob soc soe soh soo sop sor sos spa spb spc spe sph spo spp spr sps sr- sra srb src sre srh sro srp srr srs ss- ssa ssb ssc sse ssh sso ssp ssr sss