With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
From
2nd
century
BC
tin
oxide
appears
in
use
as
opacifier
,
likely
in
the
form
of
cassiterite
mineral
.
From:O
2nd:O
century:O
BC:O
tin:O
oxide:O
appears:O
in:O
use:O
as:O
opacifier:O
,:O
likely:O
in:O
the:O
form:O
of:O
cassiterite:O
mineral:O
.:O