<s>
X/OS	B-Operating_System
was	O
a	O
Unix	B-Application
from	O
the	O
computer	O
manufacturer	O
Olivetti	O
.	O
</s>
<s>
It	O
was	O
based	O
on	O
4.2BSD	B-Operating_System
with	O
some	O
UNIX	B-Operating_System
System	I-Operating_System
V	I-Operating_System
support	O
.	O
</s>
