With no explanation, label each line with "O", "art-painting", "event-attack/battle/war/militaryconflict", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
He
is
best
known
for
his
painting
of
the
frigate
``
Niels
Juel
``
during
the
Battle
of
Helgoland
on
9
May
1864
.
He:O
is:O
best:O
known:O
for:O
his:O
painting:O
of:O
the:O
frigate:O
``:O
Niels:art-painting
Juel:art-painting
``:O
during:O
the:O
Battle:event-attack/battle/war/militaryconflict
of:event-attack/battle/war/militaryconflict
Helgoland:event-attack/battle/war/militaryconflict
on:O
9:O
May:O
1864:O
.:O