With no explanation, label each line with "location-GPE", "O", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
Second
Crusade
had
been
called
after
the
fall
of
Edessa
to
Zengi
in
1144
.
The:O
Second:O
Crusade:event-attack/battle/war/militaryconflict
had:O
been:O
called:O
after:O
the:O
fall:O
of:O
Edessa:location-GPE
to:O
Zengi:location-GPE
in:O
1144:O
.:O