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
terms
``
simple
expansion
locomotive
''
and
``
simple
expansion
engine
''
are
sometimes
applied
to
locomotives
to
remove
any
possible
confusion
.
The:O
terms:O
``:O
simple:O
expansion:O
locomotive:O
'':O
and:O
``:O
simple:O
expansion:O
engine:O
'':O
are:O
sometimes:O
applied:O
to:O
locomotives:O
to:O
remove:O
any:O
possible:O
confusion:O
.:O