Millisecond Forums

Hi,

I'm trying to create an experiment, in which I want to randomize 3 different blocks (each with different trials) and display a survey (in running number) after each block. I've found a forum discussion (https://www.millisecond.com/forums/Topic23902.aspx), which had some similarities, but instead of displaying the survey with a branch element I want to include it in the experiment element. Furthermore, I want to somehow randomize the experimental blocks and eliminate the possibility that one block is displayed more than once. So at the end, I want the following order of my experiment:
Part 1: randomized Block 1 or Block 2 or Block 3
Survey 1
Part 2: randomized Block 1 or Block 2 or Block 3 (no repeating of the same block as in Part 1)
Survey 2
Part 3: randomized Block 1 or Block 2 or Block 3 (no repeating of the same block as in Part 1 and 2)
Survey 3

Is there any way to write a code for this? Any help will be very much appreciated.

Thanks!