from typing import Iterable


def _all_iterables(array):
    """Return boolean to indicate all items are iterables within an array

    >>> _all_iterables([[], []])
    True
    >>> _all_iterables([[1], [2], [3]])
    True
    >>> _all_iterables([[1], [2], 3])
    False
    >>> _all_iterables([1, 2, 4])
    False
    """
    return all([isinstance(item, Iterable) for item in array])