randomising the nth image in a sequence

[Lois]

Hi, I'd like to display a sequence of 9 images in which only the 5th,
6th, 7th, or 8th will be different to the rest of the sequence. This
sequence will be used in around 72 trials, in which the odd image in
the 5th, 6th etc. position will be randomised.

Would anyone have a suggestion of the best way to do this please?

Thanks,
Lois
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