pge pgg pgi pgk pgl pgp pgr pgs pia pib pid pie pig pii pik pil pip pir pis pka pkb pkd pke pkg pki pkl pkp pkr pks pla plb pld ple plg pli plk pll plp plr pls ppa ppb ppd ppe ppg ppi ppk ppl ppp ppr pps pra prb prd pre prg pri prk prl prp prr prs ps- psa psb psd pse psg psi psk psl psp psr pss ra- raa rab rad rae rag rai rak ral rap rar ras rba rbb rbd rbe rbg rbi rbk rbl rbp rbr rbs rda rdb rdd rde rdg rdi rdl rdp rdr rds re- rea reb red ree reg rei rek rel rep rer res rga rgb rgd rge rgg rgi rgk rgp rgr rgs ria rib rid rie rig rii rik ril rip rir ris rkb rke rkg rkk rkp rks rla rld rle rlg rli rll rlp rlr rls rpa rpb rpd rpe rpg rpi rpk rpl rpp rpr rps rra rrb rrd rrg rri rrk rrl rrp rrr rrs rsa rsb rsd rse rsg rsi rsk rsl rsp rsr rss saa sab sad sae sag sai sak sal sap sar sas sba sbb sbd sbe sbg sbi sbk sbl sbp sbr sbs sda sdb sdd sde sdg sdi sdk sdl sdp sdr sds se- sea seb sed see seg sei sek sel sep ser ses sga sgb sgd sge sgg sgi sgk sgl sgp sgr sgs sia sib sid sie sig sii sik sil sip sir sis sk- ska skb skd ske skg ski skk skl skp skr sks sla slb sld sle slg sli slk sll slp slr sls spa spb spd spe spg spi spk spl spp spr sps sr- sra srb srd sre srg sri srk srl srp srr srs ss- ssa ssb ssd sse ssg ssi ssk ssl ssp ssr sss