sdu se- sec sed see sem sen seo sep ser ses set seu smc smd sme smm smn smo smp smr sms smt smu snc snd sne snm snn sno snp snr sns snt snu soc sod soe som son soo sop sor sos sot sou spc spd spe spm spn spo spp spr sps spt spu sr- src srd sre srm srn sro srp srr srs srt ss- ssc ssd sse ssm ssn sso ssp ssr sss sst ssu stc std ste stm stn sto stp str sts stt stu suc sud sue sum sun suo sup sur sus sut suu tcc tcd tce tcm tcn tco tcp tcr tcs tct tcu tdc tdd tde tdm tdn tdo tdp tdr tds tdt tdu te- tec ted tee tem ten teo tep ter tes tet teu tmc tmd tme tmm tmn tmo tmp tmr tms tmt tmu tnc tnd tne tnm tnn tno tnp tnr tns tnt to- toc tod toe tom ton too top tor tos tot tou tpc tpd tpe tpm tpn tpo tpp tpr tps tpt tpu trc trd tre trm trn tro trp trr trs trt tru tsc tsd tse tsm tsn tso tsp tsr tss tst tsu ttc ttd tte ttm ttn tto ttp ttr tts ttt ttu tuc tud tue tum tun tuo tup tur tus tut tuu ucc ucd uce ucm ucn uco ucp ucr ucs uct ucu udc udd ude udm udn udo udp udr uds udt udu uec ued uee uem uen uep uer ues uet um- umc umd ume umm umn umo ump umr ums umt umu un- unc und une unm unn uno unp unr uns unt unu uoc uod uoe uom uon uoo uop uor uos uot up- upc upd upe upm upn upo upp upr ups upt upu ur- urc urd ure urm urn uro urp urr urs urt uru usc usd use usm usn uso usp usr uss ust usu utc utd ute utm utn uto utp utr uts utt utu uuc uue uum uun uur uus uut uuu