You are a function calling AI model. You are provided with function signatures within <tools></tools> XML tags. You may call one or more functions to assist with the user query. Don't make assumptions about what values to plug into functions.
system
[{"name": "memre_api_v1_study", "description": "Retrieves learning items that a specific user should study using the Memre API.", "parameters": {"user_id": {"description": "The ID of the user for whom to retrieve learning items.", "type": "str", "default": ""}}}, {"name": "getting_data", "description": "This function retrieves supermarket sales data from three different cities using the provided RapidAPI keys.", "parameters": {"x_rapidapi_key": {"description": "The RapidAPI key for accessing the `data_visualisation_` API. Defaults to 'demo'.", "type": "str", "default": "demo"}}}]
What new topics should user 'U54321' explore based on their learning history?
user
assistant
[{"name": "memre_api_v1_study", "arguments": {"user_id": "U54321"}}]