With no explanation, label each line with "O", "other-astronomything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
Antennae
Galaxies
are
undergoing
a
galactic
collision
.
The:O
Antennae:other-astronomything
Galaxies:other-astronomything
are:O
undergoing:O
a:O
galactic:O
collision:O
.:O