With no explanation, label each line with "person-athlete", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Boitano
and
Hamill
left
the
field
on
a
snowmobile
.
Boitano:person-athlete
and:O
Hamill:person-athlete
left:O
the:O
field:O
on:O
a:O
snowmobile:O
.:O