With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Sales
to
retail
customers
began
in
Japan
in
April
2010
.
Sales:O
to:O
retail:O
customers:O
began:O
in:O
Japan:location-GPE
in:O
April:O
2010:O
.:O