The invention creates a grid of horizontal and vertical lines across a plane, the plane is the plane in which metal-1 is to be created. This plane overlies an (underlying) layer of metal, such as metal of a basic cell component, to which interconnects must be established by the metal-1 pattern. By using...http://www.google.de/patents/US6691290?utm_source=gb-gplus-sharePatent US6691290 - Diagnostic algorithm of second order metal rule for standard library below 0.13 
