System: Acting as an API optimization expert, examine API documentation and testing history to generate unique parameters. Ensure the parameters are different from all previous attempts. Return only the parameter dictionary.
User: Analyze this API:
Endpoint: https://apis.map.qq.com/ws/distance/v1
Method: GET
Required: [{'name': 'key', 'type': 'string', 'description': 'api_key', 'default': '6LDBZ-BF4HK-G2ZJA-ABCNH-3A44S-7OFZI'}, {'name': 'mode', 'type': 'string', 'description': '计算方式：driving（驾车）、walking（步行）。默认：driving', 'default': 'driving'}, {'name': 'from', 'type': 'string', 'description': '起点坐标，格式：lat，lng;lat，lng...（经度与纬度用英文逗号分隔，坐标间用英文分号分隔）', 'default': ''}, {'name': 'to', 'type': 'string', 'description': '终点坐标，格式：lat，lng;lat，lng...（经度与纬度用英文逗号分隔，坐标间用英文分号分隔）', 'default': ''}]
Optional: [{'name': 'output', 'type': 'string', 'description': '返回格式', 'default': ''}, {'name': 'callback', 'type': 'string', 'description': 'JSONP方式回调函数', 'default': ''}]
Test history: Initial Attempt 1:
Parameters: {'key': '6LDBZ-BF4HK-G2ZJA-ABCNH-3A44S-7OFZI', 'mode': 'walking', 'from': '39.9042,116.4074', 'to': '34.0522,-118.2437', 'output': 'json', 'callback': 'myCallbackFunction'}
Result: Failed
Analysis: Failed - possible issues: Message from API: 参数错误，坐标错误

Initial Attempt 2:
Parameters: {'key': '6LDBZ-BF4HK-G2ZJA-ABCNH-3A44S-7OFZI', 'mode': 'driving', 'from': '31.2304,121.4737', 'to': '52.5200,13.4050', 'output': 'xml', 'callback': 'newCallbackFunction'}
Result: Failed
Analysis: Failed - possible issues: Message from API: 参数错误，坐标错误

Recent Attempt 3:
Parameters: {'key': '6LDBZ-BF4HK-G2ZJA-ABCNH-3A44S-7OFZI', 'mode': 'walking', 'from': '37.7749,-122.4194', 'to': '34.0522,-118.2437', 'output': 'json', 'callback': 'uniqueCallbackFunction'}
Result: Failed
Analysis: Failed - possible issues: Message from API: 参数错误，坐标错误

Recent Attempt 4:
Parameters: {'key': '6LDBZ-BF4HK-G2ZJA-ABCNH-3A44S-7OFZI', 'mode': 'driving', 'from': '34.0522,-118.2437', 'to': '36.1699,-115.1398', 'output': 'json', 'callback': ''}
Result: Failed
Analysis: Failed - possible issues: Message from API: 参数错误，坐标错误

Recent Attempt 5:
Parameters: {'key': '6LDBZ-BF4HK-G2ZJA-ABCNH-3A44S-7OFZI', 'mode': 'driving', 'from': '48.8566,2.3522', 'to': '51.5074,-0.1278', 'output': 'json', 'callback': 'newUniqueCallback'}
Result: Failed
Analysis: Failed - possible issues: Message from API: 参数错误，坐标错误

Previously used parameters: - {'callback': '', 'from': '48.8566,2.3522', 'key': '6LDBZ-BF4HK-G2ZJA-ABCNH-3A44S-7OFZI', 'mode': 'driving', 'output': 'json', 'to': '51.5074,-0.1278'}
- {'callback': 'myCallbackFunction', 'from': '39.9042,116.4074', 'key': '6LDBZ-BF4HK-G2ZJA-ABCNH-3A44S-7OFZI', 'mode': 'walking', 'output': 'json', 'to': '34.0522,-118.2437'}
- {'callback': 'newCallbackFunction', 'from': '31.2304,121.4737', 'key': '6LDBZ-BF4HK-G2ZJA-ABCNH-3A44S-7OFZI', 'mode': 'driving', 'output': 'xml', 'to': '52.5200,13.4050'}
- {'callback': '', 'from': '34.0522,-118.2437', 'key': '6LDBZ-BF4HK-G2ZJA-ABCNH-3A44S-7OFZI', 'mode': 'driving', 'output': 'json', 'to': '36.1699,-115.1398'}
- {'callback': 'newUniqueCallback', 'from': '48.8566,2.3522', 'key': '6LDBZ-BF4HK-G2ZJA-ABCNH-3A44S-7OFZI', 'mode': 'driving', 'output': 'json', 'to': '51.5074,-0.1278'}
- {'callback': 'anotherCallbackFunction', 'from': '40.7128,-74.0060', 'key': '6LDBZ-BF4HK-G2ZJA-ABCNH-3A44S-7OFZI', 'mode': 'walking', 'output': 'json', 'to': '34.0522,-118.2437'}
- {'callback': 'uniqueCallbackFunction', 'from': '37.7749,-122.4194', 'key': '6LDBZ-BF4HK-G2ZJA-ABCNH-3A44S-7OFZI', 'mode': 'walking', 'output': 'json', 'to': '34.0522,-118.2437'}

Based on previous attempts, generate an optimized parameter set that hasn't been used before.
Assistant: