Understanding Rowan instructions


Hi there, I hope you can help me out once again with a pattern Rowan Elly by Martin Storey (Baby cardigan) I’ve cast on 15 stitches
‘Left Front, Inc 1 st at beg of next row and at same edge on foll 8 rows’, ( this I think I understand that you inc 1 stitch at start of Knit row for 8 rows) then it goes on…’.then on 2 foll 3rd rows and at the same time shaping side seam by inc 1 st at beg of 4th(8th…)and foll 6th (…)row’. I am confused as to what they mean about 'on 2 foll 3rd rows, and from where do I calculate 8th and 6th rows ?


I have this one saved in my favorites.
Call the “next row”, row 1. Increase at the front edge on rows 1,2,3,4,5,6,7,8 and 9. Then increase on rows 12 and 15. This increase will be at the beg of some rows and the end of other rows.
Increase at the side seam on rows 5and 11 for the smallest size.


Thank you so much, its such a pretty top I’m itching to complete it!!