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 ":".
They
have
been
doing
this
by
adding
fireplaces
,
more
seating
options
,
adding
WiFi
and
flat-screen
TVs
,
and
digital
menus
.
They:O
have:O
been:O
doing:O
this:O
by:O
adding:O
fireplaces:O
,:O
more:O
seating:O
options:O
,:O
adding:O
WiFi:O
and:O
flat-screen:O
TVs:O
,:O
and:O
digital:O
menus:O
.:O