smb smc sme smi smk smm smn smr sms smt smu snb snc sne sni snk snm snn snr sns snt snu sr- srb src sre sri srk srm srn srr srs srt ss- ssb ssc sse ssi ssk ssm ssn ssr sss sst ssu stb stc ste sti stk stm stn str sts stt stu sub suc sue sui suk sum sun sur sus sut suu tbb tbc tbe tbi tbk tbm tbn tbr tbs tbt tbu tcb tcc tce tci tck tcm tcn tcr tcs tct tcu te- teb tec tee tei tek tem ten ter tes tet teu tib tic tie tii tik tim tin tir tis tit tiu tkb tkc tke tkk tkm tkr tks tkt tmb tmc tme tmi tmk tmm tmn tmr tms tmt tmu tnb tnc tne tni tnk tnm tnn tnr tns tnt trb trc tre tri trk trm trn trr trs trt tru tsb tsc tse tsi tsk tsm tsn tsr tss tst tsu ttb ttc tte tti ttk ttm ttn ttr tts ttt ttu tub tuc tue tui tuk tum tun tur tus tut tuu ubb ubc ube ubi ubk ubn ubr ubs ubt ubu ucb ucc uce uci uck ucm ucn ucr ucs uct ucu ueb uec uee uei uem uen uer ues uet uib uic uie uii uim uin uir uis uit uiu ukb ukc uke uki ukk ukn ukr uku um- umb umc ume umi umm umn umr ums umt umu un- unb unc une uni unk unm unn unr uns unt unu ur- urb urc ure uri urk urm urn urr urs urt uru usb usc use usi usk usm usn usr uss ust usu utb utc ute uti utk utm utn utr uts utt utu uuc uue uum uun uur uus uut uuu