-er a-a a-b a-c aaa aab aac aae aah aak aap aar aas ab- aba abb abc abe abh abk abp abr abs ac- aca acb acc ace ach ack acp acr acs aea aeb aec aee aeh aek aep aer aes aha ahb ahc ahe ahh ahk ahp ahr ahs aka akb akc ake akh akk akp akr aks ap- apa apb apc ape aph apk app apr aps ar- ara arb arc are arh ark arp arr ars as- asa asb asc ase ash ask asp asr ass b-p baa bab bac bae bah bak bap bar bas bba bbb bbc bbe bbh bbk bbp bbr bbs bca bcb bcc bce bch bck bcp bcr bcs be- bea beb bec bee beh bek bep ber bes bha bhb bhc bhe bhh bhk bhp bhr bhs bka bkb bkc bke bkk bkp bkr bks bpa bpb bpc bpe bph bpp bpr bps bra brb bre brh brk brp brr brs bsa bsb bsc bse bsh bsk bsp bsr bss c-- caa cab cac cae cah cak cap car cas cba cbb cbc cbe cbh cbk cbp cbr cbs cca ccb ccc cce cch cck ccp ccr ccs ce- cea ceb cec cee ceh cek cep cer ces ch- cha chb chc che chh chk chp chr chs cka ckb ckc ckh cks cpa cpb cpc cpe cph cpk cpp cpr cps cra crb crc cre crh crk crp crr crs csa csb csc cse csh csk csp csr css eaa eab eac eae eah eak eap ear eas eba ebb ebc ebe ebh ebk ebp ebr ebs ec- eca ecb ecc ece ech eck ecr ecs eea eeb eec eee eek eep eer ees eha ehb ehc ehe ehh ehp ehr ehs eka ekb ekc eke ekh ekp ekr eks ep- epa epb epc epe eph epp epr eps era erb erc ere erh erk erp err ers es- esa esb esc ese esh esk esp esr ess haa hab hac hae hah hak hap har has hba hbb hbc hbe hbh hbk hbp hbr hbs hca hcb hcc hce hch hck hcp hcr hcs he- hea heb hec hee heh hek hep her hes hha hhb hhc hhe hhh hhk hhp hhr hhs hka hkb hkh hkk hkp hkr hks hpa hpb hpc hpe hph hpk hpp hpr hps hr- hra hrb hrc hre hrh hrk hrp hrr hrs hsa hsb hsc hse hsh hsk hsp hsr hss ka- kaa kab kac kae kah kak kap kar kas kba kbb kbc kbe kbh kbk kbp kbr kbs kca kcb kcc kce kch kck kcp kcr kcs ke- kea keb kec kee keh kek kep ker kes kha khe khh khk khr khs kkb kkc kke kkh kkk kkp kkr kks kpa kpc kpe kph kpk kpp kpr kps kra krc krk krp krr krs ksa ksb ksc kse ksh ksk ksp ksr kss p-p paa pab pac pae pah pak pap par pas pba pbb pbc pbe pbk pbp pbr pbs pca pcb pcc pce pch pck pcp pcr pcs pea peb pec pee peh pek pep per pes pha phb phc phe phk php phr phs pka pkb pkc pke pkp pkr pks ppa ppb ppc ppe pph ppk ppp ppr pps pra prb prc pre prh prk prp prr prs ps- psa psb psc pse psh psk psp psr pss ra- raa rab rac rae rah rak rap rar ras rba rbb rbc rbe rbh rbk rbp rbr rbs rca rcb rcc rce rch rcp rcr rcs re- rea reb rec ree reh rek rep rer res rh- rha rhb rhc rhe rhh rhp rhr rhs rkb rkc rke rkk rkp rks rpa rpb rpc rpe rph rpk rpp rpr rps rra rrb rrc rrh rrk rrp rrr rrs rsa rsb rsc rse rsh rsk rsp rsr rss saa sab sac sae sah sak sap sar sas sba sbb sbc sbe sbh sbk sbp sbr sbs sca scb scc sce sch sck scp scr scs se- sea seb sec see seh sek sep ser ses sh- sha shb shc she shh shk shp shr shs sk- ska skb skc ske skh skk skp skr sks spa spb spc spe sph spk spp spr sps sr- sra srb src sre srh srk srp srr srs ss- ssa ssb ssc sse ssh ssk ssp ssr sss