I did figured out myself how to do it. So I will write it down here in case anybody else have the same doubt.
So, since the loop analyze each element of the array individually:
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you need to create a “target point” variable.
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Set the variable to get the data from the loop each time the branch is true.
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Create a new array with the target point variable which will only take the true values.
I attach the blue print so it’s more clear.