<s>
The	O
Wide	B-Algorithm
Field	I-Algorithm
and	I-Algorithm
Planetary	I-Algorithm
Camera	I-Algorithm
2	I-Algorithm
improved	O
on	O
its	O
predecessor	O
and	O
incorporated	O
corrective	O
optics	O
needed	O
to	O
overcome	O
the	O
main	O
mirror	O
defect	O
.	O
</s>
<s>
On	O
its	O
return	O
to	O
Earth	O
,	O
the	O
WFPC	O
was	O
disassembled	O
and	O
parts	O
of	O
it	O
were	O
used	O
in	O
Wide	B-Algorithm
Field	I-Algorithm
Camera	I-Algorithm
3	I-Algorithm
,	O
which	O
was	O
installed	O
in	O
Hubble	O
on	O
May	O
14	O
,	O
2009	O
,	O
as	O
part	O
of	O
Servicing	O
Mission	O
4	O
,	O
replacing	O
WFPC2	B-Algorithm
.	O
</s>
<s>
WFPC	O
was	O
replaced	O
by	O
the	O
Wide	B-Algorithm
Field	I-Algorithm
and	I-Algorithm
Planetary	I-Algorithm
Camera	I-Algorithm
2	I-Algorithm
which	O
included	O
its	O
own	O
internal	O
corrective	O
optics	O
.	O
</s>
<s>
WFPC2	B-Algorithm
was	O
replaced	O
by	O
the	O
Wide	B-Algorithm
Field	I-Algorithm
Camera	I-Algorithm
3	I-Algorithm
in	O
2009	O
.	O
</s>
<s>
After	O
return	O
to	O
Earth	O
,	O
WFPC	O
was	O
disassembled	O
and	O
its	O
parts	O
cannibalized	O
to	O
make	O
WFC3	B-Algorithm
.	O
</s>
