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 ":".
It
occurs
as
an
alteration
of
magnesium
carbonate
minerals
by
arsenic
bearing
solutions
.
It:O
occurs:O
as:O
an:O
alteration:O
of:O
magnesium:other-chemicalthing
carbonate:other-chemicalthing
minerals:O
by:O
arsenic:other-chemicalthing
bearing:O
solutions:O
.:O