sreo sres srhs srmc sros sscc ssce sscs ssec ssee ssem sses ssex sshs ssmc ssoc ssrc ssrm ssrs sssc sssh sssm ssss syce sych syco sycr syer syes syhe sym- syme syms syre syro syrs syry syse syso syss syxe xces xchm xeer xeme xer- xero xers xexe xmms xmos xoco xohm xome xoom xoro xors xoxo xoyo xxxo xxxx xxxy xyr- yccc ycch ycee yche yech yeer yees yehe yehr yehs yeme yemm yeoh yeom yeos yeox yere yerm yero yerr yers yery yesh yesm yeso yess yeye yeyo yeyr yher yhes ymer yoch yohe yoho yomo yore yoro yory yosh yoso yoxe yoye yoyo yrho ysco ysee yser yses ysse yssh yyyy