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Find numbers that are divisible by 3 but not a multiple of 7

**Question:**
Write a function called divisible_numbers that takes a list of numbers as input and returns a comma-separated sequence of numbers that are divisible by 3 but not a multiple of 7. The numbers should be between 2000 and 3200 (both inclusive).

**Example:**
Input: [2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009]
Output: "2001,2004"
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