With no explanation, label each line with "product-other", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Technological
answers
to
the
Type
XXI
were
available
in
the
form
of
3-centimetre
radar
and
magnetic
anomaly
detectors
in
aircraft
.
Technological:O
answers:O
to:O
the:O
Type:product-other
XXI:product-other
were:O
available:O
in:O
the:O
form:O
of:O
3-centimetre:O
radar:O
and:O
magnetic:O
anomaly:O
detectors:O
in:O
aircraft:O
.:O