The alphabet level

On the alphabet level, the neutral file may be considered as a continuous stream of symbols from the basic alphabet. 

The symbol pair denotes a set consisting of the elements listed inside 

Besides G(96) and G(94) denote the graphical representation of grave accent and circumflex accent. The graphical alphabet G denotes the union of the five sets defined above  

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Escape codes are to be used for symbols which cannot be represented by the basic alphabet defined in "The alphabet level" on page 159. The escape codes together with the normal alphabet constitute the "extended alphabet". Several extend alphabets are available. They are selected and unselected by alphabetical escape codes ... 

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