[lemma=a] [!word=severe] [lemma=restriction] [tag=IN] [□]
[lemma=a] [!word=severe] [lemma=restriction] [tag=IN] [□=□]
[lemma=a] [!word=severe] [lemma=restriction] [tag=IN] [□ | □]
However , the latter is not a real restriction because in the unconstrained case , the individual does not sell the risky asset short .