   This is the sumary of turtle pictures. The number of 1..8 is
   name of file graphpcxx.pas. Here are the functions of all programs.

   Ŀ
    1  Draw cartezian's coordinate system         
    2  Points in coordinate system                
    3  Draw point if you turn mouse               
    4  Line in direction version                  
    5  Line in general direction version          
    6  Line in general equation version           
    7  Parametrical express of line               
    8  General version 1 for drawing graphs       
   
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