Why is it impossible that two contour lines will cross on the maps you have drawn?

Why is it impossible that two contour lines will cross on the maps you have drawn?
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As two contour line are of different heights, it would be impossible for two contour lines to cross. But, the problem is when it comes to printing map details.If two contour lines cross (touch) it means that they are both at the same height. This can happen on a cliff or steep sided mountain, when the height is so close vertically, that it is easier to show a blank area with a symbol for a cliff or steep mountainside. The symbol used depends on what is used by the producer/printer of the map. The symbol for cliffs should be shown on the map's legend printed on most maps.
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