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 ":".
Within
four
years
first
his
father
and
then
his
mother
would
die
.
Within:O
four:O
years:O
first:O
his:O
father:O
and:O
then:O
his:O
mother:O
would:O
die:O
.:O