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 ":".
When
the
slide
has
completed
its
rearward
travel
,
the
recoil
spring
moves
the
slide
forward
,
chambering
another
round
.
When:O
the:O
slide:O
has:O
completed:O
its:O
rearward:O
travel:O
,:O
the:O
recoil:O
spring:O
moves:O
the:O
slide:O
forward:O
,:O
chambering:O
another:O
round:O
.:O