rik ril rin rio rir ris rit rke rkk rko rks rkt rla rld rle rli rll rln rlo rlr rls rlt rna rnd rni rnn rno rnr rns rnt roa rod roe roi rok rol ron roo ror ros rot rra rrd rri rrk rrl rrn rrr rrs rrt rsa rsd rse rsi rsk rsl rsn rso rsr rss rst rta rtd rte rti rtk rtl rtn rto rtr rts rtt saa sad sae sai sak sal san sao sar sas sat sda sdd sde sdi sdk sdl sdn sdo sdr sds sdt se- sea sed see sei sek sel sen seo ser ses set sia sid sie sii sik sil sin sio sir sis sit sk- ska skd ske ski skk skl sko skr sks skt sla sld sle sli slk sll sln slo slr sls slt sna snd sne sni snk snl snn sno snr sns snt soa sod soe soi sok sol son soo sor sos sot sr- sra srd sre sri srk srl srn sro srr srs srt ss- ssa ssd sse ssi ssk ssl ssn sso ssr sss sst sta std ste sti stk stl stn sto str sts stt taa tad tae tai tak tal tan tao tar tas tat tda tdd tde tdi tdk tdl tdn tdo tdr tds tdt te- tea ted tee tei tek tel ten teo ter tes tet tia tid tie tii tik til tin tio tir tis tit tka tke tkk tkl tko tkr tks tkt tla tld tle tli tlk tll tln tlo tlr tls tlt tna tnd tne tni tnk tnl tnn tno tnr tns tnt to- toa tod toe toi tok tol ton too tor tos tot tra trd tre tri trk trl trn tro trr trs trt tsa tsd tse tsi tsk tsl tsn tso tsr tss tst tta ttd tte tti ttk ttl ttn tto ttr tts ttt