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self.create_button("3", 1, 2) self.create_button("4", 2, 0) self.create_button("5", 2, 1) self.create_button("6", 2, 2) self.create_button("7", 3, 0) self.create_button("8", 3, 1) self.create_button("9", 3, 2) self.create_button("0", 4, 1) self.create_button(".", 4, 2) self.create_button("+", 1, 3)