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
commuting
zones
and
labor
market
areas
were
also
classified
by
the
population
of
the
largest
city
within
each
of
them
.
The:O
commuting:O
zones:O
and:O
labor:O
market:O
areas:O
were:O
also:O
classified:O
by:O
the:O
population:O
of:O
the:O
largest:O
city:O
within:O
each:O
of:O
them:O
.:O