How to search for error in pattern

I have a book called “One Skein Wonders” by Storey Publishing an am wondering how you go about searching for errors in patterns.
There is a scarf called a"Gossamer shell scarf and I don’t see how the number of stitches to CO is correct.

CO 20 stitches. But Row 1 of the pattern doesn’t even have enough stitches to do the pattern with only 20 stitches.

Row 1: K2, (K2 tog) twice, *(yo, K1) 4 times, (K2tog) 4 times; repeat from * to last 10 stitches, (yo, K1) 4 times, (K2tog) twice, K2.

Am I reading this wrong? That would be at least 28 stitches for CO to do the pattern, not 20. Help

I found their web page for errors. The book says CO 20 which I knew was wrong. The correction is CO 40.