1 times 1, 11 times 11111 times 1111 times 1111, find the law

1 * 1 = 1,11 * 11 = 121111 * 111 = 123211111 * 1111 = 1231321, the rule is n-digit multiplication, the result is 12.. n.. 21, such as 111111 * 111111 = 12345654321

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