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We divide constructs into four classes depending on whether or not they start with a double quote and whether or not they end with a double quote. We assign the fixity classes 'prefix', 'infix', 'suffix', and 'closed' to these four possibilities. Some example read:
Prefix if " then " else " Infix " + " Suffix " factorial Closed ( " )
The fixity classes are defined thus:
Charge has no effect on closed constructs. By convention, all closed constructs should have charge zero and be kept in a charge section by themselves rather than cluttering up non-zero charge sections by such constructs.
Charge inversion only occurs when prefix constructs occur after infix constructs and when suffix constructs occur before infix constructs.
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