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 ":".
At
the
right
hour
on
the
right
kind
of
day
,
the
mountain
is
clearly
reflected
upon
the
surface
of
the
pond
.
At:O
the:O
right:O
hour:O
on:O
the:O
right:O
kind:O
of:O
day:O
,:O
the:O
mountain:O
is:O
clearly:O
reflected:O
upon:O
the:O
surface:O
of:O
the:O
pond:O
.:O