[lemma=drug]? [tag=NN] [□] □
[lemma=drug]? [tag=NN] [□=□] □
[lemma=drug]? [tag=NN] [□ & □] □
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 .