With no explanation, label each line with "O", "product-software", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
On
June
17
,
2008
,
after
Hillary
Clinton
ended
her
campaign
,
number
of
followers
of
Barack
Obama
's
Facebook
account
increased
to
one
million
.
On:O
June:O
17:O
,:O
2008:O
,:O
after:O
Hillary:person-politician
Clinton:person-politician
ended:O
her:O
campaign:O
,:O
number:O
of:O
followers:O
of:O
Barack:person-politician
Obama:person-politician
's:O
Facebook:product-software
account:O
increased:O
to:O
one:O
million:O
.:O