With no explanation, label each line with "O", "event-sportsevent", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
was
the
40th
edition
of
the
Stuttgart
Open
,
and
part
of
the
ATP
World
Tour
250
series
of
the
2017
ATP
World
Tour
.
It:O
was:O
the:O
40th:O
edition:O
of:O
the:O
Stuttgart:event-sportsevent
Open:event-sportsevent
,:O
and:O
part:O
of:O
the:O
ATP:event-sportsevent
World:event-sportsevent
Tour:event-sportsevent
250:event-sportsevent
series:event-sportsevent
of:O
the:O
2017:O
ATP:event-sportsevent
World:event-sportsevent
Tour:event-sportsevent
.:O