With no explanation, label each line with "O", "person-athlete", "organization-sportsleague", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
His
twin
brother
Robin
Lopez
is
also
an
NBA
player
.
His:O
twin:O
brother:O
Robin:person-athlete
Lopez:person-athlete
is:O
also:O
an:O
NBA:organization-sportsleague
player:O
.:O