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 ":".
By
age
20
,
he
had
settled
in
the
United
States
and
was
an
assistant
to
the
Waldorf
's
Oscar
Tschirky
.
By:O
age:O
20:O
,:O
he:O
had:O
settled:O
in:O
the:O
United:location-GPE
States:location-GPE
and:O
was:O
an:O
assistant:O
to:O
the:O
Waldorf:person-other
's:person-other
Oscar:person-other
Tschirky:person-other
.:O