[-(1/2)x4]x[-(1/2)x4]

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[-(1/2)x4]x[-(1/2)x4][-(1/2)x4]x[-(1/2)x4][-(1/2)x4]x[-(1/2)x4] 

[-(1/2)x4]x[-(1/2)x4]
[-(1/2)x4]x[-(1/2)x4]

[-(1/2)x4]x[-(1/2)x4]