sfu sic sie sif sii sil sin sio sir sis sit siu slc sle slf sli sll sln slo slr sls slt slu snc sne snf sni snl snn sno snr sns snt snu soc soe sof soi sol son soo sor sos sot sou sr- src sre srf sri srl srn sro srr srs srt ss- ssc sse ssf ssi ssl ssn sso ssr sss sst ssu stc ste stf sti stl stn sto str sts stt stu suc sue suf sui sul sun suo sur sus sut suu tcc tce tcf tci tcl tcn tco tcr tcs tct tcu te- tec tee tef tei tel ten teo ter tes tet teu tfc tfe tff tfi tfl tfn tfo tfr tfs tft tfu tic tie tif tii til tin tio tir tis tit tiu tlc tle tlf tli tll tln tlo tlr tls tlt tlu tnc tne tnf tni tnl tnn tno tnr tns tnt to- toc toe tof toi tol ton too tor tos tot tou trc tre trf tri trl trn tro trr trs trt tru tsc tse tsf tsi tsl tsn tso tsr tss tst tsu ttc tte ttf tti ttl ttn tto ttr tts ttt ttu tuc tue tuf tui tul tun tuo tur tus tut tuu ucc uce ucf uci ucl ucn uco ucr ucs uct ucu uec uee uef uei uel uen uer ues uet ufc ufe uff ufi ufl ufn ufo ufr ufs uft ufu uic uie uif uii uil uin uio uir uis uit uiu ulc ule ulf uli ull uln ulo ulr uls ult ulu un- unc une unf uni unl unn uno unr uns unt unu uoc uoe uol uon uoo uor uos uot ur- urc ure urf uri url urn uro urr urs urt uru usc use usf usi usl usn uso usr uss ust usu utc ute utf uti utl utn uto utr uts utt utu uuc uue uun uur uus uut uuu