What do these decreasing instructions mean?

I’m making a stocking, and the instructions for decreasing say “K2 tog, K to 2 sts before marker, SSK, sl marker, K2 tog, K to last 2 sts, SSK (total 10 sts dec).” The pattern indicates 5 places to decrease, one at the beginning of one row, then at the beginning and end of 2 other rows. What I don’t get is how this is only decreases 10 stitches; it seems that each time I follow these instructions I would lose 3 stitches, for a total of 15 decreased stitches. Am I reading it wrong? Thanks so much!

You’re losing one stitch from the k2tog, and one from the ssk.

Sounds like you’re decreasing for the toe, in which case you’re only decreasing 4 times per round. Starting out with a decrease the “K2tog” that’s 1 stitch, knit to 2 sts before marker, that’s your second decrease, the “SSK” then the third after the marker the K2tog again, knit to the final 2 sts, for your last decrease of that round, the second SSK.