sdp sdr sds sdt sdu se- sec sed see sei sen seo sep ser ses set seu sic sid sie sii sin sio sip sir sis sit siu snc snd sne sni snn sno snp snr sns snt snu soc sod soe soi son soo sop sor sos sot sou spc spd spe spi spn spo spp spr sps spt spu sr- src srd sre sri srn sro srp srr srs srt ss- ssc ssd sse ssi ssn sso ssp ssr sss sst ssu stc std ste sti stn sto stp str sts stt stu suc sud sue sui sun suo sup sur sus sut suu tcc tcd tce tci tcn tco tcp tcr tcs tct tcu tdc tdd tde tdi tdn tdo tdp tdr tds tdt tdu te- tec ted tee tei ten teo tep ter tes tet teu tic tid tie tii tin tio tip tir tis tit tiu tnc tnd tne tni tnn tno tnp tnr tns tnt to- toc tod toe toi ton too top tor tos tot tou tpc tpd tpe tpi tpn tpo tpp tpr tps tpt tpu trc trd tre tri trn tro trp trr trs trt tru tsc tsd tse tsi tsn tso tsp tsr tss tst tsu ttc ttd tte tti ttn tto ttp ttr tts ttt ttu tuc tud tue tui tun tuo tup tur tus tut tuu ucc ucd uce uci ucn uco ucp ucr ucs uct ucu udc udd ude udi udn udo udp udr uds udt udu uec ued uee uei uen uep uer ues uet uic uid uie uii uin uio uip uir uis uit uiu un- unc und une uni unn uno unp unr uns unt unu uoc uod uoe uon uoo uop uor uos uot up- upc upd upe upi upn upo upp upr ups upt upu ur- urc urd ure uri urn uro urp urr urs urt uru usc usd use usi usn uso usp usr uss ust usu utc utd ute uti utn uto utp utr uts utt utu uuc uue uun uur uus uut uuu