<s>
Ray-traced	B-Algorithm
ambient	I-Algorithm
occlusion	I-Algorithm
is	O
a	O
computer	O
graphics	O
technique	O
and	O
ambient	O
occlusion	O
global	B-Algorithm
illumination	I-Algorithm
algorithm	I-Algorithm
using	O
ray-tracing	B-Algorithm
.	O
</s>
