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 ":".
Because
of
the
needs
of
navigation
,
particularly
the
activities
of
the
Vickers
shipyard
,
it
was
constructed
as
a
bascule
bridge
.
Because:O
of:O
the:O
needs:O
of:O
navigation:O
,:O
particularly:O
the:O
activities:O
of:O
the:O
Vickers:O
shipyard:O
,:O
it:O
was:O
constructed:O
as:O
a:O
bascule:O
bridge:O
.:O