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General information about Expert Systems below has been taken from and

An inference rule is a statement that has two parts, an if-clause and a then-clause. In D2W this is referred to as left hand side (LHS) and right hand side (RHS). The LHS is used to determine whether something is true and the RHS assigns a value if the LHS condition is true. When more than one rule is true, the more specific rule (i.e. the one with more terms on the LHS) will fire. In the case of the same specificity, rule priorities are compared.