With no explanation, label each line with "O", "location-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
This
was
happening
at
around
the
Equator
during
the
later
Carboniferous
,
forming
Pangaea
with
Avalonia
near
its
centre
but
partially
flooded
by
shallow
sea
.
This:O
was:O
happening:O
at:O
around:O
the:O
Equator:location-other
during:O
the:O
later:O
Carboniferous:O
,:O
forming:O
Pangaea:location-other
with:O
Avalonia:location-other
near:O
its:O
centre:O
but:O
partially:O
flooded:O
by:O
shallow:O
sea:O
.:O