sir sis sit siu slc slg sli sll sln slo slp slr sls slt slu snc sng sni snl snn sno snp snr sns snt snu soc sog soi sol son soo sop sor sos sot sou spc spg spi spl spn spo spp spr sps spt spu sr- src srg sri srl srn sro srp srr srs srt ss- ssc ssg ssi ssl ssn sso ssp ssr sss sst ssu stc stg sti stl stn sto stp str sts stt stu suc sug sui sul sun suo sup sur sus sut suu tcc tcg tci tcl tcn tco tcp tcr tcs tct tcu tgc tgg tgi tgl tgn tgo tgp tgr tgs tgt tgu tic tig tii til tin tio tip tir tis tit tiu tlc tlg tli tll tln tlo tlp tlr tls tlt tlu tnc tng tni tnl tnn tno tnp tnr tns tnt to- toc tog toi tol ton too top tor tos tot tou tpc tpg tpi tpl tpn tpo tpp tpr tps tpt tpu trc trg tri trl trn tro trp trr trs trt tru tsc tsg tsi tsl tsn tso tsp tsr tss tst tsu ttc ttg tti ttl ttn tto ttp ttr tts ttt ttu tuc tug tui tul tun tuo tup tur tus tut tuu ucc ucg uci ucl ucn uco ucp ucr ucs uct ucu ugc ugg ugi ugl ugn ugo ugp ugr ugs ugt ugu uic uig uii uil uin uio uip uir uis uit uiu ulc ulg uli ull uln ulo ulp ulr uls ult ulu un- unc ung uni unl unn uno unp unr uns unt unu uoc uog uol uon uoo uop uor uos uot up- upc upg upi upn upo upp upr ups upt upu ur- urc urg uri url urn uro urp urr urs urt uru usc usg usi usl usn uso usp usr uss ust usu utc uti utl utn uto utp utr uts utt utu uuc uug uun uur uus uut uuu