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 ":".
Because
of
this
,
most
of
his
notable
work
in
astronomy
was
done
elsewhere
.
Because:O
of:O
this:O
,:O
most:O
of:O
his:O
notable:O
work:O
in:O
astronomy:O
was:O
done:O
elsewhere:O
.:O