'Returns the symbol of the generator that is involved in the
i-th syllable of the associative word `self`.
Examples
>>> from sympy.combinatorics.free_groups import free_group
>>> f, a, b = free_group("a b")
>>> w = a**5*b*a**2*b**-4*a
>>> w.generator_syllable( 3 )
b'

def generator_syllable(self, i):

    return self.array_form[i][0]
