Directory [tphols-2011] is added to host the commented version of [Myhill.thy]. Directory [pres] is created to host a build session for logical image [ListP] which is essentially [Main] extended with [List_prefix.thy].

(*
  no_document use_thys ["This_Theory1", "This_Theory2"];
  use_thys ["That_Theory1", "That_Theory2", "That_Theory3"];
*)
use_thys ["../Myhill"];;