class number:
def __init__(self, n1, n2):
self.n1 = 0
self.n2 = 0
def plus(self):
print(self.n1 + self.n2)
def minus(self):
print(self.n1 - self.n2)
def div(self):
print(self.n1 / self.n2)
def mul(self):
print(self.n1 * self.n2)
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