ser ses set seu sfc sfd sfe sff sfm sfn sfp sfr sfs sft sfu smc smd sme smf smm smn smp smr sms smt smu snc snd sne snf snm snn snp snr sns snt snu spc spd spe spf spm spn spp spr sps spt spu sr- src srd sre srf srm srn srp srr srs srt ss- ssc ssd sse ssf ssm ssn ssp ssr sss sst ssu stc std ste stf stm stn stp str sts stt stu suc sud sue suf sum sun sup sur sus sut suu tcc tcd tce tcf tcm tcn tcp tcr tcs tct tcu tdc tdd tde tdf tdm tdn tdp tdr tds tdt tdu te- tec ted tee tef tem ten tep ter tes tet teu tfc tfd tfe tff tfm tfn tfp tfr tfs tft tfu tmc tmd tme tmf tmm tmn tmp tmr tms tmt tmu tnc tnd tne tnf tnm tnn tnp tnr tns tnt tpc tpd tpe tpf tpm tpn tpp tpr tps tpt tpu trc trd tre trf trm trn trp trr trs trt tru tsc tsd tse tsf tsm tsn tsp tsr tss tst tsu ttc ttd tte ttf ttm ttn ttp ttr tts ttt ttu tuc tud tue tuf tum tun tup tur tus tut tuu ucc ucd uce ucf ucm ucn ucp ucr ucs uct ucu udc udd ude udf udm udn udp udr uds udt udu uec ued uee uef uem uen uep uer ues uet ufc ufd ufe uff ufm ufn ufp ufr ufs uft ufu um- umc umd ume umf umm umn ump umr ums umt umu un- unc und une unf unm unn unp unr uns unt unu up- upc upd upe upf upm upn upp upr ups upt upu ur- urc urd ure urf urm urn urp urr urs urt uru usc usd use usf usm usn usp usr uss ust usu utc utd ute utf utm utn utp utr uts utt utu uuc uue uum uun uur uus uut uuu