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* First, determine an approximate course for each net, often by routing on a coarse grid. This step is called ''global routing'',<ref name="Soukup_1979"/> and may optionally include layer assignment. Global routing limits the size and complexity of the following detailed routing steps, which can be done grid square by grid square.
For detailed routing, the most common technique is '''rip-up and reroute''' aka '''rip-up and retry''':<ref name="Byers_1991"/>
*Select a sequence in which the nets are to be routed.
*Route each net in sequence
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