rir ris rit rke rkf rkk rko rkp rks rkt rla rle rlf rli rll rlo rlp rlr rls rlt roa roe rof roi rok rol roo rop ror ros rot rpa rpe rpf rpi rpk rpl rpo rpp rpr rps rpt rra rrf rri rrk rrl rrp rrr rrs rrt rsa rse rsf rsi rsk rsl rso rsp rsr rss rst rta rte rtf rti rtk rtl rto rtp rtr rts rtt saa sae saf sai sak sal sao sap sar sas sat se- sea see sef sei sek sel seo sep ser ses set sfa sfe sff sfi sfk sfl sfo sfp sfr sfs sft sia sie sif sii sik sil sio sip sir sis sit sk- ska ske skf ski skk skl sko skp skr sks skt sla sle slf sli slk sll slo slp slr sls slt soa soe sof soi sok sol soo sop sor sos sot spa spe spf spi spk spl spo spp spr sps spt sr- sra sre srf sri srk srl sro srp srr srs srt ss- ssa sse ssf ssi ssk ssl sso ssp ssr sss sst sta ste stf sti stk stl sto stp str sts stt taa tae taf tai tak tal tao tap tar tas tat te- tea tee tef tei tek tel teo tep ter tes tet tfa tfe tff tfi tfk tfl tfo tfp tfr tfs tft tia tie tif tii tik til tio tip tir tis tit tka tke tkk tkl tko tkp tkr tks tkt tla tle tlf tli tlk tll tlo tlp tlr tls tlt to- toa toe tof toi tok tol too top tor tos tot tpa tpe tpf tpi tpk tpl tpo tpp tpr tps tpt tra tre trf tri trk trl tro trp trr trs trt tsa tse tsf tsi tsk tsl tso tsp tsr tss tst tta tte ttf tti ttk ttl tto ttp ttr tts ttt