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# lexico_le(+List1, +List2)

List1 is lexicographically less or equal to List2

List1
  List of integers or domain variables
List2
  List of integers or domain variables

## Description

Imposes a lexicographic ordering between the two lists. I.e. either is the first element of List1 strictly smaller than the first element of List2, or the first elements are equal and the lexicographic order holds between the two list tails.

## Examples

        L=[X, Y, Z], L :: 0..9, lexico_le(L, [2, 3, 1]).		% X::0..2
        L=[X, Y, Z], L :: 0..9, lexico_le(L, [2, 3, 1]), X=2.	% Y::0..3
        L=[X, Y, Z], L :: 0..9, lexico_le(L, [2, 3, 1]), X#>2.	% fail
        L=[X, Y, Z], L :: 0..9, lexico_le(L, [2, 3, 1]), X#<2.	% true
        L=[X, Y, Z], L :: 0..9, lexico_le(L, [2, 3, 1]), Y=3.	% X::0..2
        L=[X, Y, Z], L :: 0..9, lexico_le(L, [2, 3, 1]), Y#>3.	% X::0..1
        L=[X, Y, Z], L :: 0..9, lexico_le(L, [2, 3, 1]), Y#<3.	% X::0..2
        lexico_le([2, 3, 1], [3]).					% true

## See Also

ordered / 2