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 ":".
The
presence
of
the
mules
in
front
of
the
cart
suggests
that
the
``
carroballista
''
could
be
easily
moved
through
the
battle-field
whilst
shooting
bolts
.
The:O
presence:O
of:O
the:O
mules:O
in:O
front:O
of:O
the:O
cart:O
suggests:O
that:O
the:O
``:O
carroballista:O
'':O
could:O
be:O
easily:O
moved:O
through:O
the:O
battle-field:O
whilst:O
shooting:O
bolts:O
.:O