see sel sen seo sep ser ses set seu slc sld sle sll sln slo slp slr sls slt slu snc snd sne snl snn sno snp snr sns snt snu soc sod soe sol son soo sop sor sos sot sou spc spd spe spl spn spo spp spr sps spt spu sr- src srd sre srl srn sro srp srr srs srt ss- ssc ssd sse ssl ssn sso ssp ssr sss sst ssu stc std ste stl stn sto stp str sts stt stu suc sud sue sul sun suo sup sur sus sut suu tcc tcd tce tcl tcn tco tcp tcr tcs tct tcu tdc tdd tde tdl tdn tdo tdp tdr tds tdt tdu te- tec ted tee tel ten teo tep ter tes tet teu tlc tld tle tll tln tlo tlp tlr tls tlt tlu tnc tnd tne tnl tnn tno tnp tnr tns tnt to- toc tod toe tol ton too top tor tos tot tou tpc tpd tpe tpl tpn tpo tpp tpr tps tpt tpu trc trd tre trl trn tro trp trr trs trt tru tsc tsd tse tsl tsn tso tsp tsr tss tst tsu ttc ttd tte ttl ttn tto ttp ttr tts ttt ttu tuc tud tue tul tun tuo tup tur tus tut tuu ucc ucd uce ucl ucn uco ucp ucr ucs uct ucu udc udd ude udl udn udo udp udr uds udt udu uec ued uee uel uen uep uer ues uet ulc uld ule ull uln ulo ulp ulr uls ult ulu un- unc und une unl unn uno unp unr uns unt unu uoc uod uoe uol uon uoo uop uor uos uot up- upc upd upe upn upo upp upr ups upt upu ur- urc urd ure url urn uro urp urr urs urt uru usc usd use usl usn uso usp usr uss ust usu utc utd ute utl utn uto utp utr uts utt utu uuc uue uun uur uus uut uuu