Type the channel definition in the following window. The channel definition must consist of two rows of numbers separated by commas. No spaces are allowed. No more than two lines are allowed. Each number represents a pin, each different number represents a net. Zero is used to specify an empty position. All pins with the same number will be wired together. The vertical constraint graph, when computed with respect to dogleg segments, must be acyclic. Press the button when you're done entering your channel definition.