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Verify that A^(2)=I, when A=[{:(0,1,-1),...

Verify that `A^(2)=I`, when `A=[{:(0,1,-1),(4,-3,4),(3,-3,4):}]`

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we have `A=[{:(0,1,-1),(4,-3,4),(3,-3,4):}]`
`A^(2)=[{:(0,1,-1),(4,-3,4),(4,-3,4):}][{:(0,1,-1),(4,-3,4),(3,-3,4):}]`
` =[{:(1,0,0),(0,1,0),(0,0,1):}]=I`
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