which is odd number, 2478, 2471, 2476, 2470, 2486, 2466, which is even number, 2227, 2225, 2223, 2229, 2221, 2224, which is easy form of 18/21, 9/8, 6/7, 6/8, 8/7, 0, 1, 2469+4652=, 7122, 7121, 7123, 7124, 7100, 7210, 6432-2345=, 4087, 4086, 4002, 4309, 4085, 4082, 6×9÷3=, 18, 9, 0, 6, 8, 4, 121÷11=, 10, 11, 9, 6, 12, 13

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