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 ":".
Magnesium
,
manganese
,
and
zinc
liberate
H2
:
Magnesium:other-chemicalthing
,:O
manganese:other-chemicalthing
,:O
and:O
zinc:other-chemicalthing
liberate:O
H2:other-chemicalthing
::O