|  |  5.1.165 varstr 
See
 charstr;
 int;
 nvars;
 ordstr;
 parstr;
 ring;
 var.Syntax:varstr (ring_name)
 varstr (int_expression)
 varstr (ring_name,int_expression)Type:string
Purpose:returns the list of the names of the ring variables as a string
or the name of the n-th ring variable, where n is given by the
int_expression.
If the ring name is omitted, the basering is used, thus
 varstr(n)is equivalent tovarstr(basering,n).Example:|  |   ring r=0,(x,y,z),dp;
  varstr(r);
==> x,y,z
  varstr(r,1);
==> x
  varstr(2);
==> y
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