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 ":".
For
a
number
of
months
,
he
was
suspected
of
planting
the
bomb
.
For:O
a:O
number:O
of:O
months:O
,:O
he:O
was:O
suspected:O
of:O
planting:O
the:O
bomb:product-weapon
.:O