def merge_dicts(x, y):
    """A function to merge two dictionaries, making it easier for us to make modality specific queries
    for dwi images (since they have variable extensions due to having an nii.gz, bval, and bvec file)
    
    Parameters
    ----------
    x : dict
        dictionary you want merged with y
    y : dict
        dictionary you want merged with x
    
    Returns
    -------
    dict
        combined dictionary with {x content,y content}
    """

    
    z = x.copy()
    z.update(y)
    return z