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 ":".
The
dam
's
primary
purpose
is
hydroelectric
power
generation
.
The:O
dam:O
's:O
primary:O
purpose:O
is:O
hydroelectric:O
power:O
generation:O
.:O