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All rules in the Rule Assembly Language (RAL) consist of expressions. Expressions consist of an operator and its operands. The number and type of operands depend on the operator. All expressions have the following form:
In Rule Assembly Language, a rule is a list of one or more top-level expressions. A top-level expression is the top-level operator and its associated operands in RAL statements. Rules are constraints.
For example, in the following statement,
A sub-expression is an expression that functions as an operand. Depending on the operator, a sub-expression returns a quantity or a logical true or false. The sub-expression itself is not a rule or constraint.
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