-er a-a a-b aaa aab aad aae aak aap aar aas ab- aba abb abd abe abk abp abr abs ad- ada adb add ade adk adp adr ads aea aeb aed aee aek aep aer aes aka akb akd ake akk akp akr aks ap- apa apb apd ape apk app apr aps ar- ara arb ard are ark arp arr ars as- asa asb asd ase ask asp asr ass b-p baa bab bad bae bak bap bar bas bba bbb bbd bbe bbk bbp bbr bbs bda bdb bdd bde bdk bdp bdr bds be- bea beb bed bee bek bep ber bes bka bkb bke bkk bkp bkr bks bpa bpb bpd bpe bpp bpr bps bra brb brd bre brk brp brr brs bsa bsb bsd bse bsk bsp bsr bss daa dab dad dae dak dap dar das dba dbb dbd dbe dbk dbp dbr dbs dda ddb ddd dde ddk ddp ddr dds de- dea deb ded dee dek dep der des dka dkb dke dkk dkp dkr dks dpa dpb dpd dpe dpk dpp dpr dps dra drb drd dre drk drp drr drs dsa dsb dsd dse dsk dsp dsr dss eaa eab ead eae eak eap ear eas eba ebb ebd ebe ebk ebp ebr ebs ed- eda edb edd ede edk edp edr eds eea eeb eed eee eek eep eer ees eka ekb ekd eke ekp ekr eks ep- epa epb epd epe epp epr eps era erb erd ere erk erp err ers es- esa esb esd ese esk esp esr ess ka- kaa kab kad kae kak kap kar kas kba kbb kbd kbe kbk kbp kbr kbs kda kdb kde kdk kdp kdr kds ke- kea keb ked kee kek kep ker kes kkb kke kkk kkp kkr kks kpa kpd kpe kpk kpp kpr kps kra krd krk krp krr krs ksa ksb ksd kse ksk ksp ksr kss p-p paa pab pad pae pak pap par pas pba pbb pbd pbe pbk pbp pbr pbs pda pdb pdd pde pdk pdp pdr pds pea peb ped pee pek pep per pes pka pkb pkd pke pkp pkr pks ppa ppb ppd ppe ppk ppp ppr pps pra prb prd pre prk prp prr prs ps- psa psb psd pse psk psp psr pss ra- raa rab rad rae rak rap rar ras rba rbb rbd rbe rbk rbp rbr rbs rda rdb rdd rde rdp rdr rds re- rea reb red ree rek rep rer res rkb rke rkk rkp rks rpa rpb rpd rpe rpk rpp rpr rps rra rrb rrd rrk rrp rrr rrs rsa rsb rsd rse rsk rsp rsr rss saa sab sad sae sak sap sar sas sba sbb sbd sbe sbk sbp sbr sbs sda sdb sdd sde sdk sdp sdr sds se- sea seb sed see sek sep ser ses sk- ska skb skd ske skk skp skr sks spa spb spd spe spk spp spr sps sr- sra srb srd sre srk srp srr srs ss- ssa ssb ssd sse ssk ssp ssr sss