rkk rko rks rkt rna rnb rnd rng rni rnn rno rnr rns rnt roa rob rod rog roi rok ron roo ror ros rot rra rrb rrd rrg rri rrk rrn rrr rrs rrt rsa rsb rsd rsg rsi rsk rsn rso rsr rss rst rta rtb rtd rtg rti rtk rtn rto rtr rts rtt saa sab sad sag sai sak san sao sar sas sat sba sbb sbd sbg sbi sbk sbn sbo sbr sbs sbt sda sdb sdd sdg sdi sdk sdn sdo sdr sds sdt sga sgb sgd sgg sgi sgk sgn sgo sgr sgs sgt sia sib sid sig sii sik sin sio sir sis sit sk- ska skb skd skg ski skk sko skr sks skt sna snb snd sng sni snk snn sno snr sns snt soa sob sod sog soi sok son soo sor sos sot sr- sra srb srd srg sri srk srn sro srr srs srt ss- ssa ssb ssd ssg ssi ssk ssn sso ssr sss sst sta stb std stg sti stk stn sto str sts stt taa tab tad tag tai tak tan tao tar tas tat tba tbb tbd tbg tbi tbk tbn tbo tbr tbs tbt tda tdb tdd tdg tdi tdk tdn tdo tdr tds tdt tga tgb tgg tgi tgk tgn tgo tgr tgs tgt tia tib tid tig tii tik tin tio tir tis tit tka tkb tkg tkk tko tkr tks tkt tna tnb tnd tng tni tnk tnn tno tnr tns tnt to- toa tob tod tog toi tok ton too tor tos tot tra trb trd trg tri trk trn tro trr trs trt tsa tsb tsd tsg tsi tsk tsn tso tsr tss tst tta ttb ttd ttg tti ttk ttn tto ttr tts ttt