With no explanation, label each line with "O", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Van
Buren
is
sometimes
confused
with
John
Van
Buren
,
the
son
of
President
Martin
Van
Buren
.
Van:person-politician
Buren:person-politician
is:O
sometimes:O
confused:O
with:O
John:person-politician
Van:person-politician
Buren:person-politician
,:O
the:O
son:O
of:O
President:O
Martin:person-politician
Van:person-politician
Buren:person-politician
.:O