def toMarkdown(entities):
    """Convert entities to markdown"""
    md_string = []
    for e in entities:
        if e['key'] != 'graphic':
            ent = '- [{0}]({1})'.format(e['value'], e['key'].replace(' ', '_'))
            md_string.append(ent)
    if len(md_string) > 2:
        md_string = ' '.join(md_string)
    else:
        md_string = None
    return md_string