Within the rectangle, draw a line to connect from circle 1 to the other circle 1, then draw a line from circle 2 to the other circle 2, and so on. There should not be any intersections.
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Draw a line (line A) from 3 to 3 and draw another line (line B) from 4 to 4 first. Since there is no intersection for line A and B, there must be a gap between lines. Draw a line from 1 to 1 to go through the gap. Draw another line from 2 to 2 to go through the gap again.