The <= function returns the symbol TRUE if for all its arguments, argument n1 is less than or equal to argument n, otherwise it returns the symbol FALSE. Note that <= compares only numeric values and will convert integers to floats when necessary for comparison.
Syntax
(<= <numeric-expression> <numeric-expression>+)
Example
CLIPS> (<= 3 5 5) TRUE CLIPS> (<= 5 3 5) FALSE CLIPS>
See portability note in section 12.1.13.