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 ":".
Ramón
y
Cajal
's
staining
technique
,
still
in
use
,
is
called
Cajal
's
Stain
.
Ramón:O
y:O
Cajal:O
's:O
staining:O
technique:O
,:O
still:O
in:O
use:O
,:O
is:O
called:O
Cajal:O
's:O
Stain:O
.:O