With no explanation, label each line with "product-other", "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
It
reached
first
place
in
the
US
top
iPad
book
sales
in
the
same
month
.
It:O
reached:O
first:O
place:O
in:O
the:O
US:location-GPE
top:O
iPad:product-other
book:O
sales:O
in:O
the:O
same:O
month:O
.:O