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
canton
's
primary
school
program
requires
students
to
attend
for
four
years
.
The:O
canton:O
's:O
primary:O
school:O
program:O
requires:O
students:O
to:O
attend:O
for:O
four:O
years:O
.:O