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"le" stands for "Less than or Equal to".
"le" takes two items from the stack, compares them and pushes back 1 if the first is less than, or equal to the second - or 0 if the first is greater than the second.
It is an error to compare two values of different types: either both must integers or both must be strings.
10 20 le println # -- prints 1 10 10 le println # -- prints 1 20 10 le println # -- prints 0
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