def is_wellformed(conjunction):
    """
    Parameters
    ----------
    conjunction : list

    Returns
    -------
    bool
        True if it is wellformed, otherwise False.
    """
    nr_of_elements = len(conjunction)
    elements = set()
    for line in conjunction:
        if len(line) != nr_of_elements:
            return False
        for element in line:
            elements.add(element)
    if len(elements) > nr_of_elements:
        return False
    return True