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 ":".
The
reduction
potential
of
around
0.77
volts
is
similar
to
that
of
other
triphenylmethane
dyes
.
The:O
reduction:O
potential:O
of:O
around:O
0.77:O
volts:O
is:O
similar:O
to:O
that:O
of:O
other:O
triphenylmethane:other-chemicalthing
dyes:O
.:O