Inc on sleeve, how many rows between inc & how many st inc?

I’m struggling to understand the increase on this pattern, can anyone work it out?
1st row knit
2nd row P3 (k1, p3) to end
these 2 rows set the patt.
cont in patt inc 1 st at each end of 3rd and 2 foll 6th rows then on every 8th row until there are 63 sts, taking inc sts into patt.

Welcome!
Which size are you making, 1st, 2nd, 3rd?

1st size

Ok, increase at each end of row 3 and then rows 9 and 15. Finally increase at each end of rows 23,31,39,47 and so on until there are 63sts. Enjoy!

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thank you