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 ":".
In
this
capacity
he
used
thorium
as
a
treatment
for
cancer
.
In:O
this:O
capacity:O
he:O
used:O
thorium:O
as:O
a:O
treatment:O
for:O
cancer:O
.:O