Struggling with a Rowan Pattern

Hi
I am knitting a tank top and unable to understand . I started with 113 stitches and need to inc so 121.
Having just knitted 4 rows of st stitch , what does inc 1st at each of 7th and 3 foll, 20th rows ? mean, Many thanks

Welcome to KH!
Increase at each end of rows 7, 27,47 and 67. That’s 2 increases per increase row, one at the beginning and one at the end of the row.

Aaah that makes sense, thank you so much :grinning: