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 ":".
One
year
later
,
they
designed
their
first
two-seater
plane
,
the
Avia
BH-1
.
One:O
year:O
later:O
,:O
they:O
designed:O
their:O
first:O
two-seater:O
plane:O
,:O
the:O
Avia:product-airplane
BH-1:product-airplane
.:O