With no explanation, label each line with "O", "other-chemicalthing", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
As
a
result
,
electron
density
builds
up
above
and
below
to
the
left
and
right
of
the
central
C–C
bond
.
As:O
a:O
result:O
,:O
electron:O
density:O
builds:O
up:O
above:O
and:O
below:O
to:O
the:O
left:O
and:O
right:O
of:O
the:O
central:O
C–C:other-chemicalthing
bond:other-chemicalthing
.:O