With no explanation, label each line with "O", "product-software", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
``
2010
-
2011
:
''
Brichter
worked
for
Twitter
during
this
time
after
he
sold
Tweetie
along
with
his
whole
company
in
2010
.
``:O
2010:O
-:O
2011:O
::O
'':O
Brichter:person-other
worked:O
for:O
Twitter:product-software
during:O
this:O
time:O
after:O
he:O
sold:O
Tweetie:product-software
along:O
with:O
his:O
whole:O
company:O
in:O
2010:O
.:O