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 ":".
``
His
mother
called
us
to
start
it
.
``:O
His:O
mother:O
called:O
us:O
to:O
start:O
it:O
.:O