With no explanation, label each line with "O", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
On
May
4th
,
1971
,
one
year
after
the
Kent
State
Massacre
,
students
gathered
again
in
the
park
to
peacefully
march
.
On:O
May:O
4th:O
,:O
1971:O
,:O
one:O
year:O
after:O
the:O
Kent:event-attack/battle/war/militaryconflict
State:event-attack/battle/war/militaryconflict
Massacre:event-attack/battle/war/militaryconflict
,:O
students:O
gathered:O
again:O
in:O
the:O
park:O
to:O
peacefully:O
march:O
.:O