With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
Vermont
Army
National
Guard
troops
trained
at
the
Fort
and
the
old
grass
airfield
is
used
occasionally
by
Army
Aviation
in
the
form
of
Army
National
Guard
helicopters
.
Vermont:O
Army:O
National:O
Guard:O
troops:O
trained:O
at:O
the:O
Fort:O
and:O
the:O
old:O
grass:O
airfield:O
is:O
used:O
occasionally:O
by:O
Army:O
Aviation:O
in:O
the:O
form:O
of:O
Army:O
National:O
Guard:O
helicopters:O
.:O