With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
If
it
had
formed
as
a
gas
giant
,
it
would
have
stayed
that
way
.
If:O
it:O
had:O
formed:O
as:O
a:O
gas:O
giant:O
,:O
it:O
would:O
have:O
stayed:O
that:O
way:O
.:O