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
authorities
met
this
expansion
of
the
strike
with
intensified
force
.
The:O
authorities:O
met:O
this:O
expansion:O
of:O
the:O
strike:O
with:O
intensified:O
force:O
.:O