<s>
Among	O
Markov	B-General_Concept
chain	I-General_Concept
Monte	I-General_Concept
Carlo	I-General_Concept
(	O
MCMC	O
)	O
algorithms	O
,	O
coupling	B-Algorithm
from	I-Algorithm
the	I-Algorithm
past	I-Algorithm
is	O
a	O
method	O
for	O
sampling	O
from	O
the	O
stationary	O
distribution	O
of	O
a	O
Markov	O
chain	O
.	O
</s>
<s>
Contrary	O
to	O
many	O
MCMC	O
algorithms	O
,	O
coupling	B-Algorithm
from	I-Algorithm
the	I-Algorithm
past	I-Algorithm
gives	O
in	O
principle	O
a	O
perfect	O
sample	O
from	O
the	O
stationary	O
distribution	O
.	O
</s>
