With no explanation, label each line with "O", "art-other", "location-park", "art-broadcastprogram", "art-film", "art-music", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Since
then
,
the
theater
company
has
co-operated
with
the
National
Park
Service
and
California
State
Parks
by
bring
their
performances
into
these
areas
turning
public
park
spaces
into
``
impromptu
playhouses
``
.
Since:O
then:O
,:O
the:O
theater:O
company:O
has:O
co-operated:O
with:O
the:O
National:location-park
Park:location-park
Service:O
and:O
California:location-park
State:location-park
Parks:location-park
by:O
bring:O
their:O
performances:O
into:O
these:O
areas:O
turning:O
public:O
park:O
spaces:O
into:O
``:O
impromptu:art-other
playhouses:art-other
``:O
.:O