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 ":".
Six
locomotives
of
the
class
were
built
;
introduced
between
1934
and
1936
.
Six:O
locomotives:O
of:O
the:O
class:O
were:O
built:O
;:O
introduced:O
between:O
1934:O
and:O
1936:O
.:O