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 ":".
They
flourished
particularly
during
the
Carboniferous
and
Permian
periods
.
They:O
flourished:O
particularly:O
during:O
the:O
Carboniferous:O
and:O
Permian:O
periods:O
.:O