With no explanation, label each line with "O", "product-weapon", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
Enfield
rifle
-musket
was
a
contributing
cause
of
the
Indian
rebellion
of
1857
.
The:O
Enfield:product-weapon
rifle:product-weapon
-musket:O
was:O
a:O
contributing:O
cause:O
of:O
the:O
Indian:O
rebellion:O
of:O
1857:O
.:O