siko siks simd simi simm simo simp sims simy siod siop sios sipi sipo sipp sips sipy sisd sisi sisk siss sisy siyi skid skig skik skim skio skip skis skog skop skpo sksd skss sky- skys skyy smgs smid smig smis smkd smki smod smog smok smos smoy smps smsd smsp smss smyk sodd sodo sods sody sogi sogo sogs soik soim sois soki sokk soko somi somm somo somy sood soog sook soom soop soos sooy sopd sopi sopo sopp sops sopy sosi soso soss soyo soys spdm spdp spdy spig spik spim spio spip spis spmd spmi spms spod spok spoo spop spos spoy sppd spps spsd spso spsp spss spy- spys ssdd ssdm ssdp ssgs ssid ssis ssop sspo ssps sssi sssm ssss sydi syds syik syis sym- symi syms sypo syso syss syyk yidi yids yips yisk yiss ykid ykko ymyd yodo yods yogi yogo yoik yoki yoko yoks yoky yomi yomo yomp yood yook yoop yopo yopy yosi yoso yoyo ypsi ysii ysop yspi yyyy