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diff --git a/even.m b/even.m
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+++ b/even.m
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+function even = even(integer_n)
+  ## Returns true if its argument is even; false otherwise.
+  ##
+  ## INPUTS:
+  ##
+  ##   * ``integer_n`` - The integer whose parity you're determining.
+  ##
+  ##
+  ## OUTPUTS:
+  ##
+  ##   * ``even`` - True if `integer_n` is even, false otherwise.
+  ##
+  even = rem(integer_n, 2) == 0;
+end