3.1.6. Numbering
the symbols

By selecting **Number** under **Edit** the numbers
of the symbols are shown. They correspond
to the order in which the symbols have been drawn.
Both symbols and expressions are numbered,
but only the number of the symbols appears. The numbers of the charges
assigned to a symbol *s* are displayed as a list of superscripts,
like for example in *s*^{3+ 5 8 10}.

In order to limit the symbols
at which the reaction step rules instructions are applied, their
numbers can be written into the **DOMAIN**
field of the computation program.

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