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The basic elements of expressions are terms:
term: identifier constant real-constant string-constant nil ( expression-list ) term.identifier term -> term term (expression-listopt) term [expression] term [expression : expressionopt] term [expression : ] term ++ term --The operators on terms all associate to the left, and their order of precedence, with the tightest listed first, is as follows:
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( ) [ ] ++ --
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