[tag=NN | lemma=","] [lemma=fire] [lemma=□] □
[tag=NN | lemma=","] [lemma=fire] [lemma=retard] □
[tag=NN | lemma=","] [lemma=fire] [lemma=","] □
Such aerosol payloads have included smoke , obscurant , fire retarding agents , crowd control agents , dye indicators , chemical / biological agents , and the like .