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class Case_one:
    def __init__(self):
        self.__a = 100
        self.__b = 200
       
    def function_a(self):
        if self.__a > 50 :
            print "function_a"
            self.__a = 200
        else:
            self.__a = 0
    def function_b(self):
        if self.__a == self.__b:
            print "function_b"
        elif self.__b < 150:
            self.__a = 0
        else:
            self.__b = 0
    def function_print(self):
        print 'a is %d' %self.__a
        print "b is %d" %self.__b


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    def function_c(self):
        c = 0
        c = self.__a+self.__b
        print "a + b",c
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