[tag=PRP] [lemma=what] [tag=NNS] [□] □
[tag=PRP] [lemma=what] [tag=NNS] [□=□] □
[tag=PRP] [lemma=what] [tag=NNS] [□ & □] □
Most important , he and his associates talked to the people who use assistive devices , asking them what works and what does n't .