Shawl - collared jacket

hi i have just started knitting and reading down the directions there is a part that i am not 100% certain how to do

as follows:

shape shoulders:
[B]cast off 11 sts at begof next 2 rows[/B] this i understand

the next part i am not sure
[B]then 10 sts at beg of of foll 2 rows[/B]
next part i understand
leave rem 30 sts on a stitch holder for collar

Here is a line by line as I understand it.

BO 11, knit to end
BO 11, knit to end
BO 10, knit to end
BO 10, knit to end
leave rem 30 st on holder