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# ?ExprX #=< ?ExprY

ExprX is less than or equal to ExprY (with integrality constraints).
*ExprX*
- Integer arithmetic expression
*ExprY*
- Integer arithmetic expression

## Description

Constrains ExprX to be less than or equal to ExprY. Also constrains all
variables appearing in ExprX and ExprY to be integral and checks that all
constants are integers.

Note that if all variables and constants appearing in this constraint
are already integral, then the constraint is equivalent to
ic:(ExprX =< ExprY).

## See Also

#< / 2, #= / 2, #>= / 2, #> / 2, #\= / 2, =< / 2, #=< / 3, suspend : #=< / 2