sok son soo sor sos sot sou sr- src sre srf sri srk srn sro srr srs srt ss- ssc sse ssf ssi ssk ssn sso ssr sss sst ssu stc ste stf sti stk stn sto str sts stt stu suc sue suf sui suk sun suo sur sus sut suu tcc tce tcf tci tck tcn tco tcr tcs tct tcu te- tec tee tef tei tek ten teo ter tes tet teu tfc tfe tff tfi tfk tfn tfo tfr tfs tft tfu tic tie tif tii tik tin tio tir tis tit tiu tkc tke tkk tko tkr tks tkt tnc tne tnf tni tnk tnn tno tnr tns tnt to- toc toe tof toi tok ton too tor tos tot tou trc tre trf tri trk trn tro trr trs trt tru tsc tse tsf tsi tsk tsn tso tsr tss tst tsu ttc tte ttf tti ttk ttn tto ttr tts ttt ttu tuc tue tuf tui tuk tun tuo tur tus tut tuu ucc uce ucf uci uck ucn uco ucr ucs uct ucu uec uee uef uei uen uer ues uet ufc ufe uff ufi ufn ufo ufr ufs uft ufu uic uie uif uii uin uio uir uis uit uiu ukc uke ukf uki ukk ukn ukr uku un- unc une unf uni unk unn uno unr uns unt unu uoc uoe uok uon uoo uor uos uot ur- urc ure urf uri urk urn uro urr urs urt uru usc use usf usi usk usn uso usr uss ust usu utc ute utf uti utk utn uto utr uts utt utu uuc uue uun uur uus uut uuu