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2.3.6. Range Operator
If M and N are of type INT, then the expression:

      M .. N

returns 

      * the list [M, M+1, ... ,N] if M <= N;
      * the empty list, [], otherwise.

If x and y are indeterminates in a ring, then
 
      x .. y

gives the indeterminates between x and y in the order they appear
in the definition of the ring.

Example

1..10;
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
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Use R ::= Q[x,y,z,a,b,c,d];
z..c;
[z, a, b, c]
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