With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
However
the
reaction
pathway
is
effectively
reversed
.
However:O
the:O
reaction:O
pathway:O
is:O
effectively:O
reversed:O
.:O