With no explanation, label each line with "product-airplane", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
XP-37
was
plagued
with
supercharger
and
visibility
problems
.
The:O
XP-37:product-airplane
was:O
plagued:O
with:O
supercharger:O
and:O
visibility:O
problems:O
.:O