[tag=VB] [tag=VBN] [lemma=by] [□=□] □
[tag=VB] [tag=VBN] [lemma=by] [lemma=□] □
[tag=VB] [tag=VBN] [lemma=by] [tag=□] □
In particular , they need to be approved by an external examiner , and have to be prepared early enough to leave time for any changes required by the external examiner . America is too large to be defeated by an external ennemy .