rko rkp rks rkt rna rnd rni rnn rno rnp rnr rns rnt roa rod rof roi rok ron roo rop ror ros rot rpa rpd rpf rpi rpk rpn rpo rpp rpr rps rpt rra rrd rrf rri rrk rrn rrp rrr rrs rrt rsa rsd rsf rsi rsk rsn rso rsp rsr rss rst rta rtd rtf rti rtk rtn rto rtp rtr rts rtt saa sad saf sai sak san sao sap sar sas sat sda sdd sdf sdi sdk sdn sdo sdp sdr sds sdt sfa sfd sff sfi sfk sfn sfo sfp sfr sfs sft sia sid sif sii sik sin sio sip sir sis sit sk- ska skd skf ski skk sko skp skr sks skt sna snd snf sni snk snn sno snp snr sns snt soa sod sof soi sok son soo sop sor sos sot spa spd spf spi spk spn spo spp spr sps spt sr- sra srd srf sri srk srn sro srp srr srs srt ss- ssa ssd ssf ssi ssk ssn sso ssp ssr sss sst sta std stf sti stk stn sto stp str sts stt taa tad taf tai tak tan tao tap tar tas tat tda tdd tdf tdi tdk tdn tdo tdp tdr tds tdt tfa tfd tff tfi tfk tfn tfo tfp tfr tfs tft tia tid tif tii tik tin tio tip tir tis tit tka tkk tko tkp tkr tks tkt tna tnd tnf tni tnk tnn tno tnp tnr tns tnt to- toa tod tof toi tok ton too top tor tos tot tpa tpd tpf tpi tpk tpn tpo tpp tpr tps tpt tra trd trf tri trk trn tro trp trr trs trt tsa tsd tsf tsi tsk tsn tso tsp tsr tss tst tta ttd ttf tti ttk ttn tto ttp ttr tts ttt