Help with my first sweater

I’m making my first adult sized sweater and I am confused by these instructions (probably overthinking them). I’m on a sleeve and after the wrists, the increases begin. These are the instructions:

Rep sleeve inc row every 8th row 3 more times, every 10th row 9 times, every 12th row, 0 times… and so on.

Does this mean that I knit 8 rows, do the increase, knit 8 more rows, do the increase, knit 8 more rows, do the increase and then knit 10 rows do the increase, etc?

Or does this mean that I knit 8 rows, do the increase, knit 2 more to get to row 10 and do the increase etc?

Any help would be appreciated.

More like your first thought but you’ll do an increase row, work 7 rows, increase on 8, do 7 rows, increase on 8 etc. You’ll do that for 4 times total. Then work 9 rows and increase on the 10th row and repeat that for a total of 9 times. Apparantly that’s it for the increases in your size (every 12th row 0 times means no increase)