sers sesc sese seso sess sfcc sfco sfcs sfer sffc sfne sfor sfos sfpc sfrc sfro sfss sncc sncf snco sncp snee snep sner snes snns snoc snoo snop snor snos snpo snpp snrs soce soco socr socs soec soen soeo soep soes sofo son- sone sono sons soof soon soop soor soos sope sopo sopp sops sore sorn soro sorr sors sose soso soss spcc spco spcs spec spee spef spen sper spes spfc spfs spne spns spoc spon spoo spop spor spos sppf spps spro sprs spse spso spsp spss srcc srec sreo sres srfc srnn srno sros srpc srps srsp sscc ssce sscp sscs ssec ssee ssep sses ssfc ssfp ssns ssoc ssop sspc sspe sspf sspo ssps ssrc ssrs sssc sssf ssss