Description: I wrote this is the first procedure. Many online calculation of 24 points, I would be the first of the composition operator, the four input and the number of groups and may, it is not a first bracketed 4X4X4X4X24 possible, but the formation of the bracketed formula to verify the results, (bracketed only (a b @ @ c) @ d, a @ (b @ c @ d), (a @ b) @ (c @ d), (a @ b) @ c @ d, a @ (b @ c) @ d, a @ @ b (c @ d) 6 forms no nested) draws a conclusion : brackets can also symbols for*/brackets around the same time, not for symbols,-; brackets can be omitted otherwise there has been a judgment of the corresponding type of code.
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