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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 set_common_attributes(span):
 """Set the common attributes."""

    common = {
        attributes_helper.COMMON_ATTRIBUTES.get('AGENT'): AGENT,
    }
    common_attrs = Attributes(common)\
        .format_attributes_json()\
        .get('attributeMap')

    _update_attr_map(span, common_attrs)