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 ":".
Cerium
hexaboride
,
like
lanthanum
hexaboride
,
slowly
evaporates
during
cathode
operation
.
Cerium:other-chemicalthing
hexaboride:other-chemicalthing
,:O
like:O
lanthanum:other-chemicalthing
hexaboride:other-chemicalthing
,:O
slowly:O
evaporates:O
during:O
cathode:O
operation:O
.:O