Select random number in a series

I want to know logic over how to select six random numbers between 0 to 8 where if (0,1) or (1,2) or (0,2) got select then the remaining one number out of (0,3) shall not be selected again same goes for 3 to 5 series if (3,5) or (3,4) or (4,5) got selected then remaining one number shall not be selected.

So for example in series 0 to 8 six number can be (0,1,3,5,6,8) or (1,2,4,5,7,8) etc