<s>
Copycat	B-Language
is	O
a	O
model	O
of	O
analogy	O
making	O
and	O
human	O
cognition	O
based	O
on	O
the	O
concept	O
of	O
the	O
parallel	B-Architecture
terraced	I-Architecture
scan	I-Architecture
,	O
developed	O
in	O
1988	O
by	O
Douglas	O
Hofstadter	O
,	O
Melanie	O
Mitchell	O
,	O
and	O
others	O
at	O
the	O
,	O
Indiana	O
University	O
Bloomington	O
.	O
</s>
<s>
The	O
original	O
Copycat	B-Language
was	O
written	O
in	O
Common	B-Language
Lisp	I-Language
and	O
is	O
bitrotten	O
(	O
as	O
it	O
relies	O
on	O
now-outdated	O
graphics	O
libraries	O
for	O
Lucid	B-Language
Common	I-Language
Lisp	I-Language
)	O
;	O
however	O
,	O
Java	O
and	O
Python	O
ports	O
exist	O
.	O
</s>
<s>
Copycat	B-Language
produces	O
answers	O
to	O
such	O
problems	O
as	O
"	O
abc	O
is	O
to	O
abd	O
as	O
ijk	O
is	O
to	O
what	O
?	O
"	O
</s>
<s>
Copycat	B-Language
's	O
architecture	O
is	O
tripartite	O
,	O
consisting	O
of	O
a	O
slipnet	O
,	O
a	O
working	O
area	O
(	O
also	O
called	O
workspace	B-Application
,	O
similar	O
to	O
blackboard	B-General_Concept
systems	I-General_Concept
)	O
,	O
and	O
the	O
coderack	O
(	O
with	O
the	O
codelets	O
)	O
.	O
</s>
<s>
Copycat	B-Language
differs	O
considerably	O
in	O
many	O
respects	O
from	O
other	O
cognitive	B-Architecture
architectures	I-Architecture
such	O
as	O
ACT-R	B-Language
,	O
Soar	B-Architecture
,	O
DUAL	B-Architecture
,	O
Psi	O
,	O
or	O
subsumption	B-Architecture
architectures	I-Architecture
.	O
</s>
<s>
Copycat	B-Language
is	O
Hofstadter	O
's	O
most	O
popular	O
model	O
.	O
</s>
<s>
Since	O
the	O
1995	O
book	O
Fluid	O
Concepts	O
and	O
Creative	O
Analogies	O
describing	O
the	O
work	O
of	O
the	O
Fluid	O
Analogies	O
Research	O
Group	O
(	O
FARG	O
)	O
book	O
,	O
work	O
on	O
Copycat-like	O
models	O
has	O
continued	O
:	O
as	O
of	O
2008	O
the	O
latest	O
models	O
are	O
Phaeaco	O
(	O
a	O
Bongard	O
problem	O
solver	O
)	O
,	O
SeqSee	O
(	O
number	O
sequence	O
extrapolation	O
)	O
,	O
George	O
(	O
geometric	O
exploration	O
)	O
,	O
and	O
Musicat	O
(	O
a	O
melodic	O
expectation	O
model	O
)	O
.	O
</s>
