[The identifier ,(code "Foo"),(index :index *index1* "Foo") is a usually
used as an example. When two identifiers have to used, frequently the
second choice is ,(code "Bar"),(index :index *index1* "Bar" :shape (it "Bar")).
When three are needed, some use ,(code "Baz")
,(index :index *index1* "Baz" :shape (it "Baz")).
This illustrates how to use identifier
,(index :index *index1* "Foo" :note "How to use Foo")
,(index :index *index1* "Foo" :note "How not to use Foo")
,(index :index *index1* "Fooz")
...]