now continue like this in the different sizes: size 35/37-38/40: finish the last a.1b (= a total of 3-3 repeats of a.1b).

This is all lower case. Can you fix that?
Now continue like this in the different sizes: Size 35/37-38/40: Finish the last A.1B (= a total of 3-3 repeats of A.1B).