import re


def check_for_code_output_example( lines ):
    """
    Check a Markdown problem description file for the presence of a code input to
    output example. ie. file should have something like: double_this(4) # > 8
    """
    lines = ''.join(lines)
    match = re.search(r'`{3}.+\s`{3}', lines, re.DOTALL)
    return True if match else False