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===Step 5 (Extended)===
 
===Step 5 (Extended)===
   −
<pre>
   
Redo the development of the proof tree in existential graph format.
 
Redo the development of the proof tree in existential graph format.
   −
Each frame of the developmental scheme that follows is divided by
+
Each frame of the developmental scheme that follows is divided by a dotted line, with terms that contribute to the main term under development being shown above it and the main term itself being shown below it.
a dotted line, with terms that contribute to the main term under
  −
development being shown above it and the main term itself being
  −
shown below it.
      +
<pre>
 
o---------------------------------------------------------------------o
 
o---------------------------------------------------------------------o
 
| Hypotheses:  x : A,  y : B,  z : A=>(B=>C)                          |
 
| Hypotheses:  x : A,  y : B,  z : A=>(B=>C)                          |
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