showl - ssk abbreviations

I'm knitting a showl and the instructions call for ssk for the corner decrease...However, the abbreviation chart says to slip, slip as to purl...then you knit the two ....I thought it was slip, slip as to knit and then knit the two together...Can't find anything where ssk is mentioned with both as to purl ...All rows are knitted for the showl....Any suggestions? Big thanks ahead...Chali