1-20
                                             Concepts in
               Associations Proved
                                         Request    Document
                     by Concon
               Cylinder  +  Friction     Cylinder   Cylinder
               Cylinder  +  Length       Known      Friction
               Known     +  Kernel       Along      Length
               Along     +  Blade        Etc.       Unit
                                                    Function
               Unit      +  Cylinder
                                                    Velocity
               Function  +  Kernel
                                                    Etc.
               Velocity  +  Blade
          (a)  Section from con-
               con pair associ-
               ation list
Request Expanded
 with Concon
(b)  Selection of con-
     cepts in request
     and document with-
     out concon
 Document Expanded
     with Concon
(Cylinder)  +  Friction  ~  Friction
(Cylinder)  +  Length    ~
               Cylinder
(Known)     +  Kernel
(Along)     +  Blade
               Known
               Along
               Etc.
Recall device effect
     Length
     Cylinder
 T  {~ylinder    (Unit)
 i   Kernel   +  (Function)
 i   Blade    +  (Velocity)
 1   Unit
 I   Function
 I   Velocity
 I   Etc.
First order
~matches (type A:c)
}First order
match (type Bt)
Second order
)`natches
 ~precision device effect
    (c)  Selection of the request and document concepts using concon, with
                     five matches of three types generated
         Illustration of Recall and Precision Device Effect of Concon
                                   Fig. 7