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
expedition
had
to
turn
back
when
the
majority
of
the
indigenous
escort
absconded
.
The:O
expedition:O
had:O
to:O
turn:O
back:O
when:O
the:O
majority:O
of:O
the:O
indigenous:O
escort:O
absconded:O
.:O