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Updates two neighbouring physical nodes.
References syten::T3N::State::aIdx, build_leftContr(), syten::T3N::VarationalTrunc::Position::c, syten::T3N::VarationalTrunc::Position::go(), syten::T3N::Tree::Node< T >::Legs, std::move(), syten::T3N::VarationalTrunc::Position::n, syten::T3N::Tree::Node< T >::ndt, syten::STensorImpl::STensorProxy::parity(), syten::T3N::State::pIdx, position, syten::STensorImpl::proxy(), syten::T3N::State::rank, syten::T3N::State::rIdx, syten::T3N::VarationalTrunc::Position::s, SYTEN_ASSERT_DEBUG, trunc, trunc_err, and syten::T3N::Tree::Node< T >::v.
Referenced by update_physical().