Any element of `V` is of the form``
`[[a],[b],[(a+b)/2]]=a[,,[1/2]]+b[,,[1/2]],` for arbitrary `a` and `b.`
Thus, `V` is the span of `[,,[1/2]],[,,[1/2]]` and is therefore a two dimensional subspace of `RR^3.`
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