rns rnt rob roe rof roi rok rol ron roo ror ros rot rrb rrf rri rrk rrl rrn rrr rrs rrt rsb rse rsf rsi rsk rsl rsn rso rsr rss rst rtb rte rtf rti rtk rtl rtn rto rtr rts rtt sbb sbe sbf sbi sbk sbl sbn sbo sbr sbs sbt se- seb see sef sei sek sel sen seo ser ses set sfb sfe sff sfi sfk sfl sfn sfo sfr sfs sft sib sie sif sii sik sil sin sio sir sis sit sk- skb ske skf ski skk skl sko skr sks skt slb sle slf sli slk sll sln slo slr sls slt snb sne snf sni snk snl snn sno snr sns snt sob soe sof soi sok sol son soo sor sos sot sr- srb sre srf sri srk srl srn sro srr srs srt ss- ssb sse ssf ssi ssk ssl ssn sso ssr sss sst stb ste stf sti stk stl stn sto str sts stt tbb tbe tbf tbi tbk tbl tbn tbo tbr tbs tbt te- teb tee tef tei tek tel ten teo ter tes tet tfb tfe tff tfi tfk tfl tfn tfo tfr tfs tft tib tie tif tii tik til tin tio tir tis tit tkb tke tkk tkl tko tkr tks tkt tle tlf tli tlk tll tln tlo tlr tls tlt tnb tne tnf tni tnk tnl tnn tno tnr tns tnt to- tob toe tof toi tok tol ton too tor tos tot trb tre trf tri trk trl trn tro trr trs trt tsb tse tsf tsi tsk tsl tsn tso tsr tss tst ttb tte ttf tti ttk ttl ttn tto ttr tts ttt