serr sers sery sesc sese sess seye seyf seyn seys sfbc sfcc sfcs sfdc sfer sffc sfnb sfne sfrc sfss sncc sncf sneb sned snee sner snes snns snrs snsd snsy snye snys srbc srby srcc srde sreb srec sres srfc srnn srsd ssbn ssbr ssby sscc ssce sscs ssdc ssdd ssdf ssec ssee sses ssfc ssns ssrc ssrs sssb sssc sssf ssss syce sycr syde syds syen syer syes syfe syff syfy syn- sync synd syne syns syny syre syrs syry syse syss ybbs yben yber ybry yccc ycee ycsb ydee ydes ydre yedd yede yeds yeed yeen yeer yees yefe yeff yenc yend yene yens yerb yerd yere yern yerr yers yery yess yeye yeyr yfed ynce ynde ynes ynne yren yrne yryn ysby ysed ysee ysen yser yses ysse ysyb yyfe yyff yyyy