With no explanation, label each line with "O", "person-athlete", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
summer
before
he
entered
sixth
grade
,
Pulver
was
introduced
to
a
friend
of
the
family
,
Jack
Vantress
.
The:O
summer:O
before:O
he:O
entered:O
sixth:O
grade:O
,:O
Pulver:person-athlete
was:O
introduced:O
to:O
a:O
friend:O
of:O
the:O
family:O
,:O
Jack:person-other
Vantress:person-other
.:O