* 1st explicit :tangle yes
#+begin_src emacs-lisp :tangle yes
  "1st explicit :tangle yes"
#+end_src
* 1st explicit :tangle filename.el
#+begin_src emacs-lisp :tangle filename.el
  "1st explicit :tangle filename.el"
#+end_src
* 1st implicit default
#+begin_src emacs-lisp
  "1st implicit :tangle no"
#+end_src
* 2nd explicit :tangle yes
#+begin_src emacs-lisp :tangle yes
  "2nd explicit :tangle yes"
#+end_src
* explicit :tangle no
#+begin_src emacs-lisp :tangle no
  "explicit :tangle no"
#+end_src
* 2nd explicit :tangle filename.el
#+begin_src emacs-lisp :tangle filename.el
  "2nd explicit :tangle filename.el"
#+end_src
* 2nd implicit default
#+begin_src emacs-lisp
  "2nd implicit :tangle no"
#+end_src