<s>
In	O
machine	O
learning	O
,	O
repeated	B-Algorithm
incremental	I-Algorithm
pruning	I-Algorithm
to	I-Algorithm
produce	I-Algorithm
error	I-Algorithm
reduction	I-Algorithm
(	O
RIPPER	O
)	O
is	O
a	O
propositional	O
rule	B-Algorithm
learner	I-Algorithm
proposed	O
by	O
William	O
W	O
.	O
Cohen	O
as	O
an	O
optimized	O
version	O
of	O
IREP	O
.	O
</s>
