def _casing_permutations(noun_chunk):
    """Generates casing permutations before wiki2vec entity lookup

    Case matters during lookup into the pretrained entity embeddings, so
    generate some permuatations to avoid misses.

    Parameters
    ----------
    noun_chunk : spacy.tokens.Span

    Returns
    -------
    list of str
        Different permutations of casing of the input.
    """
    return [noun_chunk.text.capitalize(), noun_chunk.text.title()]