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 ":".
The
league
was
formed
in
the
1980s
.
The:O
league:O
was:O
formed:O
in:O
the:O
1980s:O
.:O