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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_cytoband_names():
 """Returns the names of available cytoband data files >> get_cytoband_names() ['ucsc-hg38', 'ucsc-hg19'] """

    return [
        n.replace(".json.gz", "")
        for n in pkg_resources.resource_listdir(__name__, _data_dir)
        if n.endswith(".json.gz")
    ]