With no explanation, label each line with "O", "other-astronomything", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Thus
,
in
many
stories
and
books
the
Asteroid
Belt
,
if
not
a
positive
hazard
,
is
still
a
rarely
visited
backwater
in
a
colonized
Solar
System
.
Thus:O
,:O
in:O
many:O
stories:O
and:O
books:O
the:O
Asteroid:other-astronomything
Belt:other-astronomything
,:O
if:O
not:O
a:O
positive:O
hazard:O
,:O
is:O
still:O
a:O
rarely:O
visited:O
backwater:O
in:O
a:O
colonized:O
Solar:other-astronomything
System:O
.:O