The bottom left hand corners of the first row of black squares are
equal distance apart along the x axis and are centered inside the blue
squares.
The bottom left hand corners of the first row of black squares are
equal distance apart along the x and y axis and are centered inside
the blue squares.
The bottom left hand corners of the first row of black squares are
same distance apart in the x axis as the first row of squares and are
same distance apart in the y axis as the second row of squares.