(QT (DQL ``) (QTC (S (S (BASENP (NNS Workers)) (VP (ADVP (RB always)) (VP (VP (VBP breathe) (PRT (RP in))) (BASENP (NN aluminum) (NN dust))))) (SBAR (RB even) (SBAR (IN though) (S (BASENP (PRP they)) (VP (VP (VBP put) (PRT (RP on))) (BASENP (NNS masks))))))) (PERIOD .)) (DQR ''))