Find all four-digit prime numbers whose digits are monotonically increasing from left-to-right.
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monotonically increasing means < not <= Doddy
According to the New Oxford American Dictionary, monotonic means "varying in such a way that it either never decreases or never increases." If something monotonically increases (i.e., never decreases), >= is appropriate. In like fashion, if something monotonically decreases (i.e., never increases), <= is also appropriate.