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": "find_longest_palindromic_substring", "description": "Finds the longest palindromic substring in a string.", "parameters": {"s": {"description": "The input string.", "type": "str"}}}, {"name": "binary_addition", "description": "Adds two binary numbers and returns the result as a binary string.", "parameters": {"a": {"description": "The first binary number.", "type": "str"}, "b": {"description": "The second binary number.", "type": "str"}}}, {"name": "cell_density", "description": "Calculates the cell density based on the optical density (OD) and dilution factor.", "parameters": {"od": {"description": "The optical density of the sample.", "type": "float", "default": 1000000000.0}, "dilution": {"description": "The dilution factor applied to the sample.", "type": "int", "default": 1000000000.0}, "factor": {"description": "The calibration factor for converting OD to cell density. Defaults to 1e9.", "type": "float, optional"}}}, {"name": "california_alimony", "description": "Calculates the total alimony one spouse would have to pay to the other in California over a given duration.", "parameters": {"payor_monthly_income": {"description": "The monthly gross income of the payor spouse.", "type": "int"}, "recipient_monthly_income": {"description": "The monthly gross income of the recipient spouse.", "type": "int"}, "duration_years": {"description": "The duration of the alimony in years.", "type": "int"}}}]
Find the longest palindromic substring in the strings 'racecar' and 'level'. Also, calculate the cell density with an optical density of 0.5, dilution factor of 2, and calibration factor of 1e9.
user
assistant
[{"name": "find_longest_palindromic_substring", "arguments": {"s": "racecar"}}, {"name": "find_longest_palindromic_substring", "arguments": {"s": "level"}}, {"name": "cell_density", "arguments": {"od": 0.5, "dilution": 2, "factor": 1000000000.0}}]