def cons(self, i):


    """cons(i) is TRUE <=> b[i] is a consonant."""
    if self.b[i] == 'a' or self.b[i] == 'e' or self.b[i] == 'i' or self.b[i] == 'o' or self.b[i] == 'u':
        return 0
    if self.b[i] == 'y':
        if i == self.k0:
            return 1 
    else:
        return (not self.cons(i - 1))
    return 1