With no explanation, label each line with "location-GPE", "O", "event-disaster", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
It
weakened
while
turning
to
the
north
,
and
after
diminishing
to
a
tropical
storm
Chataan
struck
eastern
Japan
on
July
10
.
It:O
weakened:O
while:O
turning:O
to:O
the:O
north:O
,:O
and:O
after:O
diminishing:O
to:O
a:O
tropical:O
storm:O
Chataan:event-disaster
struck:O
eastern:O
Japan:location-GPE
on:O
July:O
10:O
.:O