<s>
Subtract-with-carry	O
is	O
a	O
pseudorandom	B-Algorithm
number	I-Algorithm
generator	I-Algorithm
:	O
one	O
of	O
many	O
algorithms	O
designed	O
to	O
produce	O
a	O
long	O
series	O
of	O
random-looking	O
numbers	O
based	O
on	O
a	O
small	O
amount	O
of	O
starting	O
data	O
.	O
</s>
<s>
It	O
is	O
of	O
the	O
lagged	B-Algorithm
Fibonacci	I-Algorithm
type	O
introduced	O
by	O
George	O
Marsaglia	O
and	O
Arif	O
Zaman	O
in	O
1991	O
.	O
</s>
<s>
"	O
Lagged	B-Algorithm
Fibonacci	I-Algorithm
"	O
refers	O
to	O
the	O
fact	O
that	O
each	O
random	O
number	O
is	O
a	O
function	O
of	O
two	O
of	O
the	O
preceding	O
numbers	O
at	O
some	O
specified	O
,	O
fixed	O
offsets	O
,	O
or	O
"	O
lags	O
"	O
.	O
</s>
<s>
It	O
is	O
one	O
of	O
three	O
random	O
number	O
generator	O
engines	O
included	O
in	O
the	O
standard	O
C++11	B-Language
library	O
.	O
</s>
