(self, a, b)
:param a: the query that must occur before the second.
        :param b: the query that must occur after the first.
:param a: the query that must occur before the second.
        :param b: the query that must occur after the first.
: param a : the query that must occur before the second . : param b : the query that must occur after the first .
def __init__(self, a, b):
        """
        :param a: the query that must occur before the second.
        :param b: the query that must occur after the first.
        """

        self.a = a
        self.b = b
        self.q = And([a, b])
def __init__ ( self , a , b ) : self . a = a self . b = b self . q = And ( [ a , b ] )