| ##### 7.7.4.0. arrange Procedure from library `dmod.lib` (see dmod_lib). Usage: arrange(p); int p Return: ring Purpose: set up the polynomial, describing a hyperplane arrangement Note: must be executed in a commutative ring Assume: basering is present and it is commutative Example:
    LIB "dmod.lib";
    ring X = 0,(x,y,z,t),dp;
    poly q = arrange(3);
    factorize(q,1);
    ==> _[1]=x
    ==> _[2]=x+z
    ==> _[3]=y
    ==> _[4]=y+z
    ==> _[5]=x+y
    ==> _[6]=x+y+z
    ==> _[7]=z

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