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 ":".
which
used
it
as
a
plasma
research
laboratory
.
which:O
used:O
it:O
as:O
a:O
plasma:O
research:O
laboratory:O
.:O