(*+
−
  no_document use_thys ["This_Theory1", "This_Theory2"];+
−
  use_thys ["That_Theory1", "That_Theory2", "That_Theory3"];+
−
*)+
−
+
−
use_thy "ListP";+
−
use_thys ["../Prefix_subtract", "../Myhill_1", "../Myhill_2"];+
−