anchor.diff:          ! **however, the values of P__ etc will ideally be reference-determinant dependent, what is the best way to order this sequence?**
   
   
  -elttype:if(choose_double_elt_type <= Po_ ) then
  +        if(choose_double_elt_type <= Po_ ) then
               !     _
               !    / \
               !    \./____.
  
positive.code:             end if
  
  
          else elttype
              
              !      __   __ 
              !    ./  \./  \.
  
negative.code: 
  
  
          endif 
  
  
  
  