Gradual list of angles

Hi Guys,

If I have a list of 35 angles from 0 to pi/2 with a step of (pi/2)/35 (equal steps) and I need to modify it to become with non-equal steps, say for example, first 5 items with a step equal to 0, second 5 items with a step equal to a tiny angle, third 5 items with a step equal to a big angel, fourth 5 items with a step equal to a tiny angle equal to the second 5 items, and the last fifth 5 items with a step equal to 0 ... and of course should remain between 0 and pi/2 ... How can I do this with an easy way with less components ?

I hope my question is clear.

Thanks.