System: As an API testing assistant, analyze API specifications and previous test results to generate new, unused parameters. Avoid using any parameters from the previous attempts. Return only the parameter dictionary.
User: API Specification:
URL: https://covid-19-news.p.rapidapi.com/v1/covid
Method: GET
Required Parameters: [{'name': 'q', 'type': 'STRING', 'description': 'A word to search on from the list: `covid`, `covid-19`, `coronavirus`, `коронавирус`, `koronavirüs`, `التاجى`.', 'default': 'covid'}]
Optional Parameters: [{'name': 'media', 'type': 'STRING', 'description': 'Adds to the output of the call two more variables: `media` (the main image published with an article) and `media_content` (a comma-separated string of all images used in an article).', 'default': 'True'}, {'name': 'lang', 'type': 'STRING', 'description': 'Specifies the language of the search. Allowed values include various ISO language codes. Specifying the language will make your search more relevant.', 'default': 'en'}, {'name': 'from', 'type': 'STRING', 'description': 'From which point in time to start the search. No specific format is required. Defaults to one week ago at midnight UTC.', 'default': ''}, {'name': 'page', 'type': 'NUMBER', 'description': 'The number of the page. Use it to scroll through the results. Defaults to 1.', 'default': ''}, {'name': 'search_in', 'type': 'STRING', 'description': 'By default, we search what you specified in `q` in both `title` and `summary` of the article. However, you can limit this to either `title` or `summary`.', 'default': ''}, {'name': 'to', 'type': 'STRING', 'description': 'Until which point in time to search for. The default timezone is UTC.', 'default': ''}, {'name': 'topic', 'type': 'STRING', 'description': 'The topic to which you want to restrict the articles of your choice. This parameter is experimental.', 'default': ''}, {'name': 'not_sources', 'type': 'STRING', 'description': 'One or more sources to be excluded from the search. Comma-separated string.', 'default': ''}, {'name': 'to_rank', 'type': 'NUMBER', 'description': 'Upper boundary of the rank of news website to filter by.', 'default': ''}, {'name': 'from_rank', 'type': 'NUMBER', 'description': 'Lowest boundary of the rank of news website to filter by. Lower rank means that a source is more popular.', 'default': ''}, {'name': 'sort_by', 'type': 'STRING', 'description': 'Sorting options: `relevancy`, `date`, or `rank`.', 'default': ''}, {'name': 'page_size', 'type': 'NUMBER', 'description': 'How many articles to return per page. Defaults to 50, max is 100.', 'default': ''}, {'name': 'sources', 'type': 'STRING', 'description': 'One or more news resources to filter your search. Comma-separated string.', 'default': ''}, {'name': 'country', 'type': 'STRING', 'description': 'The country to which you want to narrow your search. This parameter is experimental.', 'default': ''}, {'name': 'ranked_only', 'type': 'STRING', 'description': 'Limit the search only for the sources which are in the top 1 million online websites.', 'default': ''}]
Previous attempts: Initial Attempt 1:
Parameters: {'media': 'True', 'lang': 'es', 'from': '2023-10-01', 'page': 2, 'search_in': 'title', 'to': '2023-10-10', 'topic': 'health', 'not_sources': 'source1,source2', 'to_rank': 50, 'from_rank': 1, 'sort_by': 'date', 'page_size': 20, 'sources': 'source3,source4', 'country': 'US', 'ranked_only': 'True'}
Result: Failed
Analysis: Failed - possible issues: Message from API: such [topic] is not supported

Initial Attempt 2:
Parameters: {'media': 'True', 'lang': 'fr', 'from': '2023-10-05', 'page': 1, 'search_in': 'summary', 'to': '2023-10-15', 'topic': 'vaccine', 'not_sources': 'source5,source6', 'to_rank': 100, 'from_rank': 10, 'sort_by': 'relevancy', 'page_size': 50, 'sources': 'source7,source8', 'country': 'FR', 'ranked_only': 'False'}
Result: Failed
Analysis: Failed - possible issues: Message from API: such [topic] is not supported

Recent Attempt 3:
Parameters: {'q': 'covid', 'media': 'True', 'lang': 'en', 'from': '2023-09-01', 'page': 1, 'search_in': 'summary', 'to': '2023-09-30', 'not_sources': 'source9,source10', 'to_rank': 75, 'from_rank': 5, 'sort_by': 'rank', 'page_size': 30, 'sources': 'source11,source12', 'country': 'UK', 'ranked_only': 'False'}
Result: Success
Analysis: Success - parameters worked well

Already used parameters: - {'country': 'US', 'from': '2023-10-01', 'from_rank': '1', 'lang': 'es', 'media': 'True', 'not_sources': 'source1,source2', 'page': '2', 'page_size': '20', 'ranked_only': 'True', 'search_in': 'title', 'sort_by': 'date', 'sources': 'source3,source4', 'to': '2023-10-10', 'to_rank': '50', 'topic': 'health'}
- {'country': 'FR', 'from': '2023-10-05', 'from_rank': '10', 'lang': 'fr', 'media': 'True', 'not_sources': 'source5,source6', 'page': '1', 'page_size': '50', 'ranked_only': 'False', 'search_in': 'summary', 'sort_by': 'relevancy', 'sources': 'source7,source8', 'to': '2023-10-15', 'to_rank': '100', 'topic': 'vaccine'}
- {'country': 'UK', 'from': '2023-09-01', 'from_rank': '5', 'lang': 'en', 'media': 'True', 'not_sources': 'source9,source10', 'page': '1', 'page_size': '30', 'q': 'covid', 'ranked_only': 'False', 'search_in': 'summary', 'sort_by': 'rank', 'sources': 'source11,source12', 'to': '2023-09-30', 'to_rank': '75'}

Rules:
1. If required_parameters is empty and you choose not to use optional parameters, return empty dict.
2. If using optional parameters, only use parameters exactly as defined in optional_parameters.
3. Do not create new parameters that are not in the specification.

Generate valid parameters:
Assistant: