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
company
switched
owners
in
October
2004
and
since
expanded
the
line
of
model
rockets
including
general
rockets
,
payload
,
and
pyramid
rockets
.
The:O
company:O
switched:O
owners:O
in:O
October:O
2004:O
and:O
since:O
expanded:O
the:O
line:O
of:O
model:O
rockets:O
including:O
general:O
rockets:O
,:O
payload:O
,:O
and:O
pyramid:O
rockets:O
.:O