[lemma=drug]? [tag=NN] [word=program] [□]
[lemma=drug]? [tag=NN] [word=program] [□=□]
[lemma=drug]? [tag=NN] [word=program] [□ & □]
Implementation of the research program outlined in the preceding section requires a large and rapid expansion of the NACA staff , modification and extension of existing NACA facilities , and the acquisition of new research facilities .