reo rer res ret rkc rke rkk rko rks rkt rla rlc rld rle rll rln rlo rlr rls rlt rna rnc rnd rnn rno rnr rns rnt roa roc rod roe rok rol ron roo ror ros rot rra rrc rrd rrk rrl rrn rrr rrs rrt rsa rsc rsd rse rsk rsl rsn rso rsr rss rst rta rtc rtd rte rtk rtl rtn rto rtr rts rtt saa sac sad sae sak sal san sao sar sas sat sca scc scd sce sck scl scn sco scr scs sct sda sdc sdd sde sdk sdl sdn sdo sdr sds sdt se- sea sec sed see sek sel sen seo ser ses set sk- ska skc skd ske skk skl sko skr sks skt sla slc sld sle slk sll sln slo slr sls slt sna snc snd sne snk snl snn sno snr sns snt soa soc sod soe sok sol son soo sor sos sot sr- sra src srd sre srk srl srn sro srr srs srt ss- ssa ssc ssd sse ssk ssl ssn sso ssr sss sst sta stc std ste stk stl stn sto str sts stt taa tac tad tae tak tal tan tao tar tas tat tca tcc tcd tce tck tcl tcn tco tcr tcs tct tda tdc tdd tde tdk tdl tdn tdo tdr tds tdt te- tea tec ted tee tek tel ten teo ter tes tet tka tkc tke tkk tkl tko tkr tks tkt tla tlc tld tle tlk tll tln tlo tlr tls tlt tna tnc tnd tne tnk tnl tnn tno tnr tns tnt to- toa toc tod toe tok tol ton too tor tos tot tra trc trd tre trk trl trn tro trr trs trt tsa tsc tsd tse tsk tsl tsn tso tsr tss tst tta ttc ttd tte ttk ttl ttn tto ttr tts ttt