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 ":".
In
the
first
step
,
phenylhydrazine
is
condensed
with
cyclohexanone
to
the
corresponding
imine
.
In:O
the:O
first:O
step:O
,:O
phenylhydrazine:other-chemicalthing
is:O
condensed:O
with:O
cyclohexanone:other-chemicalthing
to:O
the:O
corresponding:O
imine:O
.:O