| #### D.8.8.3 boxSet Procedure from library `rootisolation.lib` (see rootisolation_lib). Usage: `boxSet(B, i, I)`; `B box, i int, I interval` Return: new box `C` where `C[i]==I` Purpose: modifies a single entry of a box Example:
    LIB "rootisolation.lib";
    ring R = 0,(x,y,z),dp;
    box B; B;
    ==> [0, 0] x [0, 0] x [0, 0]
    B = boxSet(B, 2, bounds(-1,1)); B;
    ==> [0, 0] x [-1, 1] x [0, 0]
    B = boxSet(B, 1, B[2]); B;
    ==> [-1, 1] x [-1, 1] x [0, 0]

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