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Construct helper function, which actually glues together the tensor for 2rdm and more.
References std::vector< T >::back(), std::vector< T >::begin(), std::vector< T >::end(), syten::Basis::flipped(), std::vector< T >::front(), syten::genFuse(), syten::genSplit(), syten::Tensor< rank >::getBasis(), syten::split(), and syten::MPS::State::uIdx.