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 ":".
Tribute
was
paid
to
the
women
who
had
played
a
crucial
role
in
helping
children
survive
.
Tribute:O
was:O
paid:O
to:O
the:O
women:O
who:O
had:O
played:O
a:O
crucial:O
role:O
in:O
helping:O
children:O
survive:O
.:O