With no explanation, label each line with "location-GPE", "O", "person-politician", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
The
throne
of
Lithuania
was
now
occupied
by
Casimir
's
son
Alexander
,
a
weak
and
lethargic
prince
so
incapable
of
defending
his
possessions
against
the
persistent
attacks
of
the
Muscovites
that
he
attempted
to
save
them
by
a
matrimonial
compact
,
wedding
Helena
,
Ivan
's
daughter
.
The:O
throne:O
of:O
Lithuania:location-GPE
was:O
now:O
occupied:O
by:O
Casimir:person-politician
's:O
son:O
Alexander:person-politician
,:O
a:O
weak:O
and:O
lethargic:O
prince:O
so:O
incapable:O
of:O
defending:O
his:O
possessions:O
against:O
the:O
persistent:O
attacks:O
of:O
the:O
Muscovites:O
that:O
he:O
attempted:O
to:O
save:O
them:O
by:O
a:O
matrimonial:O
compact:O
,:O
wedding:O
Helena:person-other
,:O
Ivan:person-other
's:O
daughter:O
.:O