With no explanation, label each line with "O", "other-educationaldegree", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
He
completed
his
Doctor
of
Philosophy
(
PhD
)
degree
in
1975
.
He:O
completed:O
his:O
Doctor:other-educationaldegree
of:other-educationaldegree
Philosophy:other-educationaldegree
(:O
PhD:other-educationaldegree
):O
degree:O
in:O
1975:O
.:O