With no explanation, label each line with "O", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
They
also
acquired
Texas
GenCo
in
2006
,
Reliant
Energy
in
2009
,
and
Green
Mountain
Energy
in
2010
.
They:O
also:O
acquired:O
Texas:organization-company
GenCo:organization-company
in:O
2006:O
,:O
Reliant:organization-company
Energy:organization-company
in:O
2009:O
,:O
and:O
Green:organization-company
Mountain:organization-company
Energy:organization-company
in:O
2010:O
.:O