python二维list去重

源数据
[[‘妇科诊区’], [‘其他诊区’], [‘其他诊区’], [‘其他诊区’], [‘其他诊区’], [‘内科诊区’], [‘内科诊区’], [‘内科诊区’], [‘内科诊区’], [‘内科诊区’], [‘内科诊区’], [‘内科诊区’], [‘内科诊区’], [‘内科诊区’], [‘内科诊区’], [‘内科诊区’], [‘内科诊区’], [‘内科诊区’], [‘内科诊区’], [‘外科诊区’], [‘其他诊区’], [‘儿科诊区’], [‘儿科诊区’], [‘外科诊区’], [‘其他诊区’], [‘其他诊区’], [‘妇科诊区’], [‘妇科诊区’], [‘妇科诊区’], [‘妇科诊区’], [‘妇科诊区’], [‘妇科诊区’], [‘内科诊区’], [‘外科诊区’], [‘儿科诊区’], [‘内科诊区’], [‘内科诊区’], [‘内科诊区’], [‘其他诊区’], [‘其他诊区’], [‘其他诊区’], [‘其他诊区’], [‘其他诊区’], [‘外科诊区’], [‘外科诊区’], [‘外科诊区’], [‘外科诊区’], [‘外科诊区’], [‘外科诊区’], [‘外科诊区’], [‘外科诊区’], [‘外科诊区’], [‘外科诊区’], [‘生活服务区’], [‘生活服务区’], [‘生活服务区’], [‘生活服务区’], [‘其他诊区’], [‘生活服务区’], [‘生活服务区’], [‘生活服务区’], [‘生活服务区’], [‘生活服务区’], [‘其他诊区’], [‘生活服务区’], [‘病区’], [‘病区’], [‘病区’], [‘病区’]] [[‘妇科诊区’], [‘其他诊区’], [‘其他诊区’], [‘其他诊区’