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": "displacement", "description": "Calculates the displacement of an object given its initial velocity, acceleration, and time.", "parameters": {"initial_velocity": {"description": "The initial velocity of the object.", "type": "float"}, "acceleration": {"description": "The acceleration of the object.", "type": "float"}, "time": {"description": "The time elapsed.", "type": "float"}}}, {"name": "least_common_multiple", "description": "Computes the least common multiple (LCM) of two positive integers.", "parameters": {"a": {"description": "The first positive integer.", "type": "int"}, "b": {"description": "The second positive integer.", "type": "int"}}}, {"name": "permutation_count", "description": "Calculates the number of permutations of k elements from a set of n elements.", "parameters": {"n": {"description": "The total number of elements in the set.", "type": "int"}, "k": {"description": "The number of elements to choose for the permutation.", "type": "int"}}}, {"name": "is_valid_palindrome", "description": "Checks if a string is a valid palindrome, considering only alphanumeric characters and ignoring case.", "parameters": {"s": {"description": "The input string.", "type": "str"}}}, {"name": "potential_energy", "description": "Calculates the electrostatic potential energy given the charge and voltage.", "parameters": {"charge": {"description": "The electric charge.", "type": "float"}, "voltage": {"description": "The electric potential difference (voltage).", "type": "float"}}}, {"name": "merge_sorted_lists", "description": "Merges two sorted lists into a single sorted list.", "parameters": {"list1": {"description": "The first sorted list.", "type": "List[int]"}, "list2": {"description": "The second sorted list.", "type": "List[int]"}}}, {"name": "is_perfect_square", "description": "Checks if a number is a perfect square.", "parameters": {"num": {"description": "The number to check.", "type": "int"}}}]
How many permutations of 3 elements can be made from a set of 9 elements? Also, is the string 'A Santa at NASA' a valid palindrome?
user
assistant
[{"name": "permutation_count", "arguments": {"n": 9, "k": 3}}, {"name": "is_valid_palindrome", "arguments": {"s": "A Santa at NASA"}}]