How can I implement pseudo-random selection from a list?

[Tobias]

Dear all,

again a rather elementary issue stroke me when I was testing a new
paradigm. When I have four target types, it often happens that one of
them is used 10 times in a row. Let's not discuss how random E-Primes
"random" is (I don't really trust it!). But: How can I implement a
pseudorandom selection from a list?

Let's say I want E-Prime to choose randomly trials from a list, but
one of the four target types must not be repeated more than twice in a
row.

I didn't find anything like that in the options, maybe some code
helps. Has anyone of you ever tried to do such a thing?

Looking forward to reading your answers!

Best,
Tobias

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