Human: set subtract another set. Assistant: 
Here is a Python function to create a set subtract another set

def set_subtract(a, b):
    """
    :param set a: set to be subtracted
    :param set b: set to be subtracted
    :return: set of elements in a but not in b
    :rtype: set
    """
    return set(a) - set(b)

# Enter the sets
a = set([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
b = set([1, 2, 3, 4, 5, 6, 7, 8, 9])

# Calling the function
print((set_subtract(a, b)))

#Example Output
# {10}

#Remember to inspect code for bugs.