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
boys
did
not
even
have
to
wear
dress
shirts
and
ties
,
other
than
on
Fridays
for
assemblies
,
then
a
controversial
relaxing
of
the
traditional
demeanor
of
prep
school
students
.
The:O
boys:O
did:O
not:O
even:O
have:O
to:O
wear:O
dress:O
shirts:O
and:O
ties:O
,:O
other:O
than:O
on:O
Fridays:O
for:O
assemblies:O
,:O
then:O
a:O
controversial:O
relaxing:O
of:O
the:O
traditional:O
demeanor:O
of:O
prep:O
school:O
students:O
.:O