How do I increase each end of row in consecutive rows?

by Katharina
(Australia)

Hello,

My knitting pattern directs me to:

"Cast on 57 sts and work k1 p1 ribbing, casting on additionally at each edge 6 sts 3 times, 4 sts 4 times and 2 sts 4 times"

This sounds straightforward but, if I increase 6 sts at the beginning and end of Row 1, then turn the work, and increase 6 sts at the beginning of Row 2, the 6 sts from the start of Row 2 and the 6 from the end of Row 1 become a single line of 12 new sts.

How can I differentiate the 6 sts from the end of Row 1, from the 6 sts at the start of Row 2?

At first I thought the pattern meant just to increase at one end of each row, but then the piece (it's a collar) was clearly growing too large and I undid it and started again. But now i don't know how to resolve the problem.

I'd be really grateful for some assistance!