def METHOD_NAME(self, basepaths):
    """
    Returns a list of paths where all known (valid) module classes have
    been added to each of the given base paths.
    """
    valid_module_classes = build_option('valid_module_classes')
    paths = []
    for path in basepaths:
        for moduleclass in valid_module_classes:
            paths.extend([os.path.join(path, moduleclass)])
    return paths