<s>
Conflict	B-Application
resolution	I-Application
strategies	I-Application
are	O
used	O
in	O
production	B-Application
systems	I-Application
in	O
artificial	B-Application
intelligence	I-Application
,	O
such	O
as	O
in	O
rule-based	O
expert	B-Application
systems	I-Application
,	O
to	O
help	O
in	O
choosing	O
which	O
production	B-Application
rule	I-Application
to	O
fire	O
.	O
</s>
<s>
Conflict	B-Application
resolution	I-Application
strategies	I-Application
fall	O
into	O
several	O
main	O
categories	O
.	O
</s>
<s>
This	O
is	O
the	O
strategy	O
that	O
Prolog	B-Language
interpreters	O
use	O
by	O
default	O
,	O
but	O
any	O
strategy	O
may	O
be	O
implemented	O
by	O
building	O
suitable	O
rules	O
in	O
a	O
Prolog	B-Language
system	O
.	O
</s>
