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