| #### D.8.2.4 unitMatrix2 Procedure from library `interval.lib` (see interval_lib). Usage: unitMatrix2(n) Return: nxn unit matrix Example:
    LIB "interval.lib";
    ring R = 0,x,lp;
    ivmat E = unitMatrix2(4); E;
    ==> [1, 1],[0, 0],[0, 0],[0, 0]
    ==> [0, 0],[1, 1],[0, 0],[0, 0]
    ==> [0, 0],[0, 0],[1, 1],[0, 0]
    ==> [0, 0],[0, 0],[0, 0],[1, 1]
    ==>

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