A method of computing an inversion of a nearly Toeplitz n by n matrix. Methods for producing a maize plant that comprise crossing maize variety PHAJT with another maize plant. A minimum current level of the set current pulse applied to the phase-change memory cells in any stage may be higher than a reference current level for the cells of the array. The total thickness of the two sheets of the dielectric component does not exceed about 4 mils and preferably does not exceed about 3 mils. Accordingly, a multi-cable umbilical cord system is provided that combines and couples a number of power, control, and gas deliver cables. An input device allows the viewer to move a pointer over different interactive areas of the guide and the function performed when the area is activated is displayed in a contextual help window.