My first cardigan - what does this line mean!?

[emma1515]

Hi there,

I've been knitting scarves for a while, and wish to move onto my first cardigan. I've found a 'vintage' pattern which I'd like to try, but some of the first instructions are confusing me a little. Here they are... I've highlighted the confusing bits in red.

BACK: With MC and Size 8 needles cast on 85(91-97-101) sts. Work in pat as follows: Row 1: (Right side of work) 0(K 3 - K 6 - K 1), *P 1, K 6, repeat from * across, ending P 1, then 0(K 3 - K 6 - K 1). Row 2: 0(P 3 - P 6 - P 1), *K 1, P 6, repeat from * across, ending K 1, then 0(P 3 - P 6 - P 1) . Repeat these 2 rows for pat.

At first I thought that these were related to the size, but that still doesn't make sense. Is anyone able to translate this for me?

Thanks!