With no explanation, label each line with "location-GPE", "O", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
His
sons
,
Henri
,
Félix
,
Frédéric
and
Werner
would
play
an
important
role
in
the
Belgian
revolution
and
in
the
political
life
of
the
Kingdom
of
Belgium
.
His:O
sons:O
,:O
Henri:person-politician
,:O
Félix:person-politician
,:O
Frédéric:person-politician
and:O
Werner:person-politician
would:O
play:O
an:O
important:O
role:O
in:O
the:O
Belgian:location-GPE
revolution:O
and:O
in:O
the:O
political:O
life:O
of:O
the:O
Kingdom:location-GPE
of:location-GPE
Belgium:location-GPE
.:O