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 ":".
Henry
I
of
England
and
Eustace
III
of
Boulogne
were
his
sons-in-law
,
making
him
the
maternal
grandfather
of
Empress
Matilda
,
William
Adelin
and
Matilda
of
Boulogne
.
Henry:person-politician
I:person-politician
of:O
England:location-GPE
and:O
Eustace:person-politician
III:person-politician
of:O
Boulogne:person-politician
were:O
his:O
sons-in-law:O
,:O
making:O
him:O
the:O
maternal:O
grandfather:O
of:O
Empress:O
Matilda:person-politician
,:O
William:person-politician
Adelin:person-politician
and:O
Matilda:person-politician
of:O
Boulogne:person-politician
.:O