rcl rco rcp rcr rcs rct re- rea reb rec ree rek rel reo rep rer res ret rkb rkc rke rkk rko rkp rks rkt rla rlc rle rll rlo rlp rlr rls rlt roa rob roc roe rok rol roo rop ror ros rot rpa rpb rpc rpe rpk rpl rpo rpp rpr rps rpt rra rrb rrc rrk rrl rrp rrr rrs rrt rsa rsb rsc rse rsk rsl rso rsp rsr rss rst rta rtb rtc rte rtk rtl rto rtp rtr rts rtt saa sab sac sae sak sal sao sap sar sas sat sba sbb sbc sbe sbk sbl sbo sbp sbr sbs sbt sca scb scc sce sck scl sco scp scr scs sct se- sea seb sec see sek sel seo sep ser ses set sk- ska skb skc ske skk skl sko skp skr sks skt sla slb slc sle slk sll slo slp slr sls slt soa sob soc soe sok sol soo sop sor sos sot spa spb spc spe spk spl spo spp spr sps spt sr- sra srb src sre srk srl sro srp srr srs srt ss- ssa ssb ssc sse ssk ssl sso ssp ssr sss sst sta stb stc ste stk stl sto stp str sts stt taa tab tac tae tak tal tao tap tar tas tat tba tbb tbc tbe tbk tbl tbo tbp tbr tbs tbt tca tcb tcc tce tck tcl tco tcp tcr tcs tct te- tea teb tec tee tek tel teo tep ter tes tet tka tkb tkc tke tkk tkl tko tkp tkr tks tkt tla tlc tle tlk tll tlo tlp tlr tls tlt to- toa tob toc toe tok tol too top tor tos tot tpa tpb tpc tpe tpk tpl tpo tpp tpr tps tpt tra trb trc tre trk trl tro trp trr trs trt tsa tsb tsc tse tsk tsl tso tsp tsr tss tst tta ttb ttc tte ttk ttl tto ttp ttr tts ttt