rii rik ril rio rir ris rit rkc rke rkg rkk rko rks rkt rla rlc rle rlg rli rll rlo rlr rls rlt roa roc roe rog roi rok rol roo ror ros rot rra rrc rrg rri rrk rrl rrr rrs rrt rsa rsc rse rsg rsi rsk rsl rso rsr rss rst rta rtc rte rtg rti rtk rtl rto rtr rts rtt saa sac sae sag sai sak sal sao sar sas sat sca scc sce scg sci sck scl sco scr scs sct se- sea sec see seg sei sek sel seo ser ses set sga sgc sge sgg sgi sgk sgl sgo sgr sgs sgt sia sic sie sig sii sik sil sio sir sis sit sk- ska skc ske skg ski skk skl sko skr sks skt sla slc sle slg sli slk sll slo slr sls slt soa soc soe sog soi sok sol soo sor sos sot sr- sra src sre srg sri srk srl sro srr srs srt ss- ssa ssc sse ssg ssi ssk ssl sso ssr sss sst sta stc ste stg sti stk stl sto str sts stt taa tac tae tag tai tak tal tao tar tas tat tca tcc tce tcg tci tck tcl tco tcr tcs tct te- tea tec tee teg tei tek tel teo ter tes tet tga tgc tge tgg tgi tgk tgl tgo tgr tgs tgt tia tic tie tig tii tik til tio tir tis tit tka tkc tke tkg tkk tkl tko tkr tks tkt tla tlc tle tlg tli tlk tll tlo tlr tls tlt to- toa toc toe tog toi tok tol too tor tos tot tra trc tre trg tri trk trl tro trr trs trt tsa tsc tse tsg tsi tsk tsl tso tsr tss tst tta ttc tte ttg tti ttk ttl tto ttr tts ttt