With no explanation, label each line with "location-GPE", "O", "other-astronomything", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
Halley
's
Comet
was
a
``
bad
omen
''
for
King
Harold
II
of
England
but
a
``
good
omen
''
for
William
the
Conqueror
.
Halley:other-astronomything
's:other-astronomything
Comet:other-astronomything
was:O
a:O
``:O
bad:O
omen:O
'':O
for:O
King:O
Harold:person-politician
II:person-politician
of:O
England:location-GPE
but:O
a:O
``:O
good:O
omen:O
'':O
for:O
William:person-politician
the:O
Conqueror:O
.:O