In the BlackBox example, at lines 104 & 105, instead of:
    OK:=((X>=1) or (X<=MaxSize)) or ((y>=1) or (Y<=MaxSize)) or
        ((Z>=1) or (z<=maxsize));
isn't it supposed to be "and" instead of "or", like
    OK:=((X>=1) and (X<=MaxSize)) and ((y>=1) and (Y<=MaxSize)) and
        ((Z>=1) and (z<=maxsize));
?

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