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[[0,(-1)/(2),2],[(1)/(2),0,0],[-2,0,0]|q...

`[[0,(-1)/(2),2],[(1)/(2),0,0],[-2,0,0]|quad 2) [[0,(1)/(2),1],[(-1)/(2),0,0],[-1,0,0]|quad 3([0,1,0],[-1,0,1],[0,-1,0])quad ([0,2,3],[-2,0,4],[-3,-4,0])`

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