| Step | Hyp | Ref
| Expression |
| 1 | | opeq1 4402 |
. . . . 5
         |
| 2 | 1 | breq2d 4665 |
. . . 4
 
  
      |
| 3 | 2 | anbi1d 741 |
. . 3
         
  

       |
| 4 | 1 | breq1d 4663 |
. . . 4
     Cgr    
 Cgr      |
| 5 | 4 | anbi1d 741 |
. . 3
      Cgr      Cgr   
    Cgr      Cgr       |
| 6 | | opeq1 4402 |
. . . . 5
         |
| 7 | 6 | breq1d 4663 |
. . . 4
     Cgr      Cgr      |
| 8 | 7 | anbi1d 741 |
. . 3
      Cgr      Cgr        Cgr      Cgr       |
| 9 | 3, 5, 8 | 3anbi123d 1399 |
. 2
      
        Cgr      Cgr   
    Cgr      Cgr                  Cgr      Cgr   
    Cgr      Cgr        |
| 10 | | breq1 4656 |
. . . 4
 
  
      |
| 11 | 10 | anbi1d 741 |
. . 3
     
      

       |
| 12 | | opeq1 4402 |
. . . . 5
         |
| 13 | 12 | breq1d 4663 |
. . . 4
     Cgr    
 Cgr      |
| 14 | 13 | anbi2d 740 |
. . 3
      Cgr      Cgr   
    Cgr      Cgr       |
| 15 | 11, 14 | 3anbi12d 1400 |
. 2
     

        Cgr      Cgr   
    Cgr      Cgr                  Cgr      Cgr   
    Cgr      Cgr        |
| 16 | | opeq2 4403 |
. . . . 5
         |
| 17 | 16 | breq2d 4665 |
. . . 4
    
      |
| 18 | 17 | anbi1d 741 |
. . 3
     
      

       |
| 19 | 16 | breq1d 4663 |
. . . 4
     Cgr    
 Cgr      |
| 20 | | opeq2 4403 |
. . . . 5
         |
| 21 | 20 | breq1d 4663 |
. . . 4
     Cgr    
 Cgr      |
| 22 | 19, 21 | anbi12d 747 |
. . 3
      Cgr      Cgr   
    Cgr      Cgr       |
| 23 | | opeq1 4402 |
. . . . 5
         |
| 24 | 23 | breq1d 4663 |
. . . 4
     Cgr      Cgr      |
| 25 | 24 | anbi2d 740 |
. . 3
      Cgr      Cgr        Cgr      Cgr       |
| 26 | 18, 22, 25 | 3anbi123d 1399 |
. 2
     

        Cgr      Cgr   
    Cgr      Cgr                  Cgr      Cgr   
    Cgr  
   Cgr        |
| 27 | | opeq2 4403 |
. . . . 5
         |
| 28 | 27 | breq1d 4663 |
. . . 4
     Cgr      Cgr      |
| 29 | | opeq2 4403 |
. . . . 5
         |
| 30 | 29 | breq1d 4663 |
. . . 4
     Cgr      Cgr      |
| 31 | 28, 30 | anbi12d 747 |
. . 3
      Cgr      Cgr        Cgr      Cgr       |
| 32 | 31 | 3anbi3d 1405 |
. 2
     

        Cgr      Cgr   
    Cgr  
   Cgr    
             Cgr      Cgr   
    Cgr  
   Cgr        |
| 33 | | opeq1 4402 |
. . . . 5
         |
| 34 | 33 | breq2d 4665 |
. . . 4
 
  
      |
| 35 | 34 | anbi2d 740 |
. . 3
     
      

       |
| 36 | 33 | breq2d 4665 |
. . . 4
     Cgr    
 Cgr 
    |
| 37 | 36 | anbi1d 741 |
. . 3
      Cgr      Cgr        Cgr      Cgr       |
| 38 | | opeq1 4402 |
. . . . 5
   
     |
| 39 | 38 | breq2d 4665 |
. . . 4
     Cgr      Cgr      |
| 40 | 39 | anbi1d 741 |
. . 3
      Cgr      Cgr        Cgr      Cgr       |
| 41 | 35, 37, 40 | 3anbi123d 1399 |
. 2
     

        Cgr      Cgr   
    Cgr  
   Cgr    
             Cgr 
    Cgr   
    Cgr  
   Cgr        |
| 42 | | breq1 4656 |
. . . 4
 
  
      |
| 43 | 42 | anbi2d 740 |
. . 3
     
 
     
 
     |
| 44 | | opeq1 4402 |
. . . . 5
         |
| 45 | 44 | breq2d 4665 |
. . . 4
     Cgr    
 Cgr 
    |
| 46 | 45 | anbi2d 740 |
. . 3
      Cgr      Cgr        Cgr      Cgr       |
| 47 | 43, 46 | 3anbi12d 1400 |
. 2
     

        Cgr 
    Cgr   
    Cgr  
   Cgr    
             Cgr 
    Cgr 
      Cgr      Cgr        |
| 48 | | opeq2 4403 |
. . . . 5
         |
| 49 | 48 | breq2d 4665 |
. . . 4
    
      |
| 50 | 49 | anbi2d 740 |
. . 3
     
 
     
 
     |
| 51 | 48 | breq2d 4665 |
. . . 4
     Cgr 
    Cgr      |
| 52 | | opeq2 4403 |
. . . . 5
         |
| 53 | 52 | breq2d 4665 |
. . . 4
     Cgr 
    Cgr      |
| 54 | 51, 53 | anbi12d 747 |
. . 3
      Cgr      Cgr        Cgr      Cgr       |
| 55 | | opeq1 4402 |
. . . . 5
   
     |
| 56 | 55 | breq2d 4665 |
. . . 4
     Cgr      Cgr      |
| 57 | 56 | anbi2d 740 |
. . 3
      Cgr      Cgr        Cgr      Cgr 
     |
| 58 | 50, 54, 57 | 3anbi123d 1399 |
. 2
     

        Cgr 
    Cgr 
      Cgr      Cgr                  Cgr 
    Cgr 
      Cgr      Cgr        |
| 59 | | opeq2 4403 |
. . . . 5
         |
| 60 | 59 | breq2d 4665 |
. . . 4
     Cgr 
    Cgr      |
| 61 | | opeq2 4403 |
. . . . 5
         |
| 62 | 61 | breq2d 4665 |
. . . 4
     Cgr 
    Cgr      |
| 63 | 60, 62 | anbi12d 747 |
. . 3
      Cgr      Cgr 
      Cgr      Cgr 
     |
| 64 | 63 | 3anbi3d 1405 |
. 2
     

        Cgr 
    Cgr 
      Cgr      Cgr                  Cgr 
    Cgr 
      Cgr      Cgr        |
| 65 | | fveq2 6191 |
. 2
           |
| 66 | | df-ifs 32147 |
. 2
    
                                                     
   
    
   
 
  
   
    Cgr      Cgr   
    Cgr      Cgr        |
| 67 | 9, 15, 26, 32, 41, 47, 58, 64, 65, 66 | br8 31646 |
1
      
     
   
         
       
                            

        Cgr 
    Cgr 
      Cgr      Cgr        |