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This means that C<s> is B<deleted> when it ends a word.

=head3 Variables

The evironment (the C<z> part) can contain B<variables>, like C<V>
above. These are defined in the first parameter to the constructor.
I use capital letters for this, though this is not a requirement.
Variables can only be one character long. You can defined any variables
needed to state your sound changed. E.g. you could define C<S> to be
any stop, or C<K> for any coronal, or whatever.

So the variable definition and rule

  F => 'ie'

  c/i/F_t

means that C<c> changes to C<i> after a front vowel and before a C<t>.

You can use variables in the first two parts as well. For instance,