<s>
SKILL	O
is	O
a	O
Lisp	B-Language
dialect	O
used	O
as	O
a	O
scripting	B-Language
language	I-Language
and	O
PCell	O
(	O
parameterized	O
cells	O
)	O
description	O
language	O
used	O
in	O
many	O
EDA	O
software	O
suites	O
by	O
Cadence	O
Design	O
Systems	O
.	O
</s>
<s>
SKILL	O
was	O
originally	O
based	O
on	O
a	O
flavor	O
of	O
Lisp	B-Language
called	O
Franz	O
Lisp	B-Language
created	O
at	O
UC	O
Berkeley	O
by	O
the	O
students	O
of	O
Professor	O
Richard	O
J	O
.	O
Fateman	O
.	O
</s>
<s>
Franz	O
Lisp	B-Language
and	O
all	O
other	O
flavors	O
of	O
LISP	B-Language
were	O
eventually	O
superseded	O
by	O
an	O
ANSI	O
standard	O
for	O
Common	B-Language
Lisp	I-Language
.	O
</s>
<s>
Although	O
SKILL	O
was	O
used	O
initially	O
to	O
describe	O
the	O
API	B-General_Concept
rather	O
than	O
the	O
language	O
,	O
the	O
snappier	O
name	O
stuck	O
.	O
</s>
<s>
The	O
name	O
"	O
IL	O
"	O
remains	O
a	O
common	O
file	O
extension	O
used	O
for	O
SKILL	O
code	O
designating	O
that	O
the	O
code	O
contained	O
in	O
the	O
file	O
has	O
lisp-2	O
semantics	O
.	O
</s>
<s>
Another	O
possible	O
file	O
extension	O
is	O
,	O
designating	O
that	O
the	O
content	O
has	O
lisp-1	O
semantics	O
.	O
</s>
