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 ":".
Each
of
the
subgroups
is
in
turn
subdivided
to
formation
level
.
Each:O
of:O
the:O
subgroups:O
is:O
in:O
turn:O
subdivided:O
to:O
formation:O
level:O
.:O