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
early
2015
this
station
become
a
transfer
station
between
Line
2
and
Line
9
of
the
Seoul
Subway
.
In:O
early:O
2015:O
this:O
station:O
become:O
a:O
transfer:O
station:O
between:O
Line:O
2:O
and:O
Line:O
9:O
of:O
the:O
Seoul:O
Subway:O
.:O