| #### D.2.3.1 A_Z Procedure from library `general.lib` (see general_lib). Usage: A_Z("a",n); a any letter, n integer (-26<= n <=26, !=0) Return: string of n small (if a is small) or capital (if a is capital) letters, comma separated, beginning with a, in alphabetical order (or reverse alphabetical order if n<0) Example:
    LIB "general.lib";
    A_Z("c",5);
    ==> c,d,e,f,g
    A_Z("Z",-5);
    ==> Z,Y,X,W,V
    ring R = create_ring("(0,"+A_Z("A",6)+")", "("+A_Z("a",10)+")", "dp");
    R;
    ==> // coefficients: QQ(A, B, C, D, E, F)
    ==> // number of vars : 10
    ==> //        block   1 : ordering dp
    ==> //                  : names    a b c d e f g h i j
    ==> //        block   2 : ordering C

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