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 ":".
The
basin
is
heavily
eroded
by
subsequent
impacts
and
is
not
obvious
on
the
surface
.
The:O
basin:O
is:O
heavily:O
eroded:O
by:O
subsequent:O
impacts:O
and:O
is:O
not:O
obvious:O
on:O
the:O
surface:O
.:O