Randomize a vector with letters making a N back test

2021 8 30
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更新时间：2021 8 30
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Hi,
I wish to create a random letter vector that has 150 element with only the letters from A to J, which i have done here:
s='A':'J'; % Generate the Letters from A to J
str=s(randi(numel(s),150,1))';
But i wish that some of the every 3rd element after 1 element is identical. For eksample
[A G J B G H D I H C]
Thank u

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Jan
Jan 2021-8-30
Ran in:

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Ran in:
s = 'A':'J';
str = s(randi(numel(s), 1, 150));
idx = 5:4:numel(str);
str(idx) = str(idx - 3)
str = 'FBJGBBHEBCICCJEFJFJDFDECDHAGHBAIBJDBJCEDCHCAHFDIFCHDCFIFFDFHDBFHBFEIFEJFEFACFHIAHICIIHEHHABHADJCDFCAFBIGBEIJEDIIDFEDFDCGDFJHFJHFJFCHFDBDDBDCBDJADAHAAE'

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