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I've got it. It was a different method that forms the list and it was implemented in the constructor.

Hello all. I have a problem with lists. And I have the following output when it is printed out to a text file:
[{[5.1, 3.5, 1.4, 0.2, NaN];null}, {[4.9, 3.0, 1.4, 0.2, NaN];null}]

So my question...