With no explanation, label each line with "O", "event-protest", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
One
of
the
largest
strikes
of
this
era
was
the
1909-1910
Philadelphia
General
strike
.
One:O
of:O
the:O
largest:O
strikes:O
of:O
this:O
era:O
was:O
the:O
1909-1910:O
Philadelphia:event-protest
General:event-protest
strike:O
.:O