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
courtyard
is
most
often
used
in
the
spring
and
summer
.
The:O
courtyard:O
is:O
most:O
often:O
used:O
in:O
the:O
spring:O
and:O
summer:O
.:O