Return a list of the children of the specified variable object and
create variable objects for them, if they do not already exist. With
-a single argument or if @var{print-values} has a value for of 0 or
+a single argument or if @var{print-values} has a value of 0 or
@code{--no-values}, print only the names of the variables; if
@var{print-values} is 1 or @code{--all-values}, also print their
values; and if it is 2 or @code{--simple-values} print the name and