Set a new position for images that wasn't selected

What are you trying to achieve?:
I have the following task: The participant will see eight stimuli in the screen, and then they need to select one of them. After that (that’s what I’m trying to achieve) a new trial with the remaining stimuli will begin, but in a new location. I’m have some difficults to achieve that: How randomize the remaining stimuli location after selecting one of the stimuli?

What did you try to make it work?:
Here is what I have done:
SMTS.psyexp (180.3 KB)