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 ":".
This
launch
will
study
the
spectra
of
Alpha
Centauri
A
and
B
in
the
Alpha
Centauri
system
which
contains
three
stars
and
Proxima
Centauri
b
,
the
closest
exoplanet
to
the
Earth
.
This:O
launch:O
will:O
study:O
the:O
spectra:O
of:O
Alpha:other-astronomything
Centauri:other-astronomything
A:other-astronomything
and:other-astronomything
B:other-astronomything
in:O
the:O
Alpha:other-astronomything
Centauri:other-astronomything
system:O
which:O
contains:O
three:O
stars:O
and:O
Proxima:other-astronomything
Centauri:other-astronomything
b:other-astronomything
,:O
the:O
closest:O
exoplanet:O
to:O
the:O
Earth:other-astronomything
.:O