I am a little confused on these instructions. Can you help me understand them. The instructions are telling me to:

" Continue to decrease one stich at Neck Edge, every other row, 3 times (which I did);

then it is telling me to decrease every fourth row 11 times AND AT THE SAME TIME decrease one stich at Armhole edge every row 3 times; then decrease every other row 5 times and I shoudl have left 13 stiches left".

I am confused on the 11 times and at the same time to decrease one stich at armhole edge every row 3 times. My question is when do I start to decrease one stich at Armhole edge every row 3 times and when to decrease every other row 5 times.

The book I am using is Cardigans with a conscience.