Understanding directions

[Marynica23]

I'd like to know if someone could help me. I am knitting a man sweater and I don't seem to understand the following part:

"Dec 1st at neck edge only in 2nd row, then 3 [4: 5: 6: 7] foll alt rows, then every foll 4th row to 22 [26: 29: 34: 37] sts, ending with RS facing for next row."

It seems a little confusing, besides it's the first time I am doing this.
Thanks in advance for any help.
Mary