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Design pattern:
	Expert system

Description:
	Allow representation of specialized domain knowledge that can
	be used to solve problems in that domain. These problems are
	typically classification problems.

Related examples:
	The `examples/birds` example implements a bird identification
	expert system. The `examples/lpa/faults` implements an expert
	system for diagnosing automobile faults.

This design pattern is usually implemented using some representation of
rules that express the domain knowledge and a meta-interpreter for those
rules that allows asking (usually, interactively) questions about rule
premisses. Answers to those questions are stored to avoid repeating the
questions and an allow using the answers when attempting to apply other
rules that share some of the premisses.
