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Performs subspace expansion.
References syten::T3N::State::getIndex(), syten::T3N::Operator::getIndex(), syten::T3N::Tree::Node< T >::Legs, syten::T3N::Tree::Node< T >::ndt, syten::T3N::Tree::Node< T >::rt, SYTEN_ASSERT, SYTEN_ASSERT_DEBUG, syten::underThreshold(), and syten::T3N::Tree::Node< T >::v.