snc sne sni snk snl snn snr sns snt snu sr- srb src sre sri srk srl srn srr srs srt ss- ssb ssc sse ssi ssk ssl ssn ssr sss sst ssu stb stc ste sti stk stl stn str sts stt stu sub suc sue sui suk sul sun sur sus sut suu tbb tbc tbe tbi tbk tbl tbn tbr tbs tbt tbu tcb tcc tce tci tck tcl tcn tcr tcs tct tcu te- teb tec tee tei tek tel ten ter tes tet teu tib tic tie tii tik til tin tir tis tit tiu tkb tkc tke tkk tkl tkr tks tkt tlc tle tli tlk tll tln tlr tls tlt tlu tnb tnc tne tni tnk tnl tnn tnr tns tnt trb trc tre tri trk trl trn trr trs trt tru tsb tsc tse tsi tsk tsl tsn tsr tss tst tsu ttb ttc tte tti ttk ttl ttn ttr tts ttt ttu tub tuc tue tui tuk tul tun tur tus tut tuu ubb ubc ube ubi ubk ubl ubn ubr ubs ubt ubu ucb ucc uce uci uck ucl ucn ucr ucs uct ucu ueb uec uee uei uel uen uer ues uet uib uic uie uii uil uin uir uis uit uiu ukb ukc uke uki ukk ukl ukn ukr uku ulb ulc ule uli ulk ull uln ulr uls ult ulu un- unb unc une uni unk unl unn unr uns unt unu ur- urb urc ure uri urk url urn urr urs urt uru usb usc use usi usk usl usn usr uss ust usu utb utc ute uti utk utl utn utr uts utt utu uuc uue uun uur uus uut uuu