With no explanation, label each line with "O", "building-theater", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
first
reunion
of
Theodore
Roosevelt
’
s
Rough
Riders
was
held
at
the
Plaza
Hotel
in
1899
.
The:O
first:O
reunion:O
of:O
Theodore:O
Roosevelt:O
’:O
s:O
Rough:O
Riders:O
was:O
held:O
at:O
the:O
Plaza:building-theater
Hotel:building-theater
in:O
1899:O
.:O