Shaping!

Help! I’ve recently started knitting. The pattern asks to:

K10, knit into front and back of next st, knit to last 11sts, knit into front and back of next st, knit 10

Work 36 rows inc 4 sts as before in every foll 12th row

I am confused with the As Before piece, I used the knit 10, knit into front and back of next at, to increase… in every 12th row at two ends but that was only 2 sts increased instead of required 4 in the rows. I didn’t increase enough sts.

How should I have read this?

Many thanks

You’re reading this correctly and there doesn’t seem to be any earlier increase instructions.

What is the name of your pattern?