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Find Numbers Divisible by 3 but Not 7

Write a function `divisible_numbers(numbers)` that takes a list of integers and returns a comma-separated string of the values that are divisible by 3 but not by 7.

Preserve the original order of the matching numbers.

#### Example
Input: `[2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009]`
Output: `"2001,2004,2007"`
def divisible_numbers(numbers):
    """
    Returns a comma-separated sequence of numbers that are divisible by 3 but not a multiple of 7.

    Args:
    numbers (list): The list of numbers.

    Returns:
    str: The comma-separated sequence of numbers.
    """
    # TODO: Implement the divisible_numbers function
    pass