With no explanation, label each line with "location-GPE", "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Libbie
Custer
,
Custer
's
widow
,
soon
worked
to
burnish
her
husband
's
memory
,
and
during
the
following
decades
Custer
and
his
troops
came
to
be
considered
iconic
,
even
heroic
,
figures
in
American
history
.
Libbie:O
Custer:O
,:O
Custer:person-other
's:O
widow:O
,:O
soon:O
worked:O
to:O
burnish:O
her:O
husband:O
's:O
memory:O
,:O
and:O
during:O
the:O
following:O
decades:O
Custer:person-other
and:O
his:O
troops:O
came:O
to:O
be:O
considered:O
iconic:O
,:O
even:O
heroic:O
,:O
figures:O
in:O
American:location-GPE
history:O
.:O