qrs qrt qru qsa qsc qsd qsi qso qsr qst qta qtc qtd qti qto qtq qtr qts qu- qua qud que qui quo qur qus qut ra- raa rac rad rae rai ran rao raq rar ras rat rau rca rcc rcd rce rci rcn rco rcr rcs rct rcu rda rdc rdd rde rdi rdn rdo rdr rds rdt rdu re- rea rec red ree rei ren reo req rer res ret reu ria ric rid rie rii rin rio riq rir ris rit rna rnc rnd rni rnn rno rnr rns rnt rnu roa roc rod roe roi ron roo ror ros rot rou rqc rqn rqs rra rrc rrd rri rrn rrq rrr rrs rrt rru rsa rsc rsd rse rsi rsn rso rsq rsr rss rst rsu rta rtc rtd rte rti rtn rto rtq rtr rts rtt rtu rua ruc rud rue rui run ruo rur rus rut ruu saa sac sad sae sai san sao saq sar sas sat sau sca scc scd sce sci scn sco scr scs sct scu sda sdc sdd sde sdi sdn sdo sdq sdr sds sdt sdu se- sea sec sed see sei sen seo seq ser ses set seu sia sic sid sie sii sin sio siq sir sis sit siu sna snc snd sne sni snn sno snr sns snt snu soa soc sod soe soi son soo soq sor sos sot sou sqa sqd sqi sqn sqq sqr sqs sr- sra src srd sre sri srn sro srq srr srs srt ss- ssa ssc ssd sse ssi ssn sso ssq ssr sss sst ssu sta stc std ste sti stn sto stq str sts stt stu sua suc sud sue sui sun suo suq sur sus sut suu taa tac tad tae tai tan tao taq tar tas tat tau tca tcc tcd tce tci tcn tco tcr tcs tct tcu tda tdc tdd tde tdi tdn tdo tdr tds tdt tdu te- tea tec ted tee tei ten teo teq ter tes tet teu tia tic tid tie tii tin tio tir tis tit tiu tna tnc tnd tne tni tnn tno tnq tnr tns tnt to- toa toc tod toe toi ton too toq tor tos tot tou tqo tra trc trd tre tri trn tro trq trr trs trt tru tsa tsc tsd tse tsi tsn tso tsq tsr tss tst tsu tta ttc ttd tte tti ttn tto ttr tts ttt ttu tua tuc tud tue tui tun tuo tur tus tut tuu ua- uaa uac uad uae uai uan uao uaq uar uas uat uau uca ucc ucd uce uci ucn uco ucr ucs uct ucu uda udc udd ude udi udn udo udr uds udt udu uea uec ued uee uei uen uer ues uet uia uic uid uie uii uin uio uiq uir uis uit uiu un- una unc und une uni unn uno unq unr uns unt unu uoa uoc uod uoe uon uoo uor uos uot ur- ura urc urd ure uri urn uro urr urs urt uru usa usc usd use usi usn uso usr uss ust usu uta utc utd ute uti utn uto utr uts utt utu uua uuc uue uun uur uus uut uuu