@dfn{safe} by setting its @code{safe-local-variable} property. If the
property is @code{t}, that variable is always considered safe,
regardless of the value assigned to it. The
-@code{safe-local-variable} property can also be a a function taking
+@code{safe-local-variable} property can also be a function taking
exactly one argument. In that case, Emacs considers it safe to give
the variable a certain value if the function returns non-@code{nil}
when called with that value as argument. Many commonly-encountered