-er ddd dde ddk ddp ddr dds de- ded dee dek dep der des dke dkk dkp dkr dks dpd dpe dpk dpp dpr dps drd dre drk drp drr drs dsd dse dsk dsp dsr dss ed- edd ede edk edp edr eds eed eee eek eep eer ees ekd eke ekp ekr eks ep- epd epe epp epr eps erd ere erk erp err ers es- esd ese esk esp esr ess kde kdk kdp kdr kds ke- ked kee kek kep ker kes kke kkk kkp kkr kks kpd kpe kpk kpp kpr kps krd krk krp krr krs ksd kse ksk ksp ksr kss p-p pdd pde pdk pdp pdr pds ped pee pek pep per pes pkd pke pkp pkr pks ppd ppe ppk ppp ppr pps prd pre prk prp prr prs ps- psd pse psk psp psr pss rdd rde rdp rdr rds re- red ree rek rep rer res rke rkk rkp rks rpd rpe rpk rpp rpr rps rrd rrk rrp rrr rrs rsd rse rsk rsp rsr rss sdd sde sdk sdp sdr sds se- sed see sek sep ser ses sk- skd ske skk skp skr sks spd spe spk spp spr sps sr- srd sre srk srp srr srs ss- ssd sse ssk ssp ssr sss