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 ":".
Sources
revealed
that
his
mother
was
his
reason
for
making
films
and
``
..
it
is
imperative
that
she
be
present
.
''
Sources:O
revealed:O
that:O
his:O
mother:O
was:O
his:O
reason:O
for:O
making:O
films:O
and:O
``:O
..:O
it:O
is:O
imperative:O
that:O
she:O
be:O
present:O
.:O
'':O