| Step | Hyp | Ref | Expression | 
						
							| 1 |  | rblem4.1 |  | 
						
							| 2 |  | rblem4.2 |  | 
						
							| 3 |  | rblem4.3 |  | 
						
							| 4 | 3 2 | rblem1 |  | 
						
							| 5 | 4 1 | rblem1 |  | 
						
							| 6 |  | rb-ax2 |  | 
						
							| 7 |  | rb-ax2 |  | 
						
							| 8 |  | rb-ax1 |  | 
						
							| 9 | 7 8 | anmp |  | 
						
							| 10 |  | rb-ax2 |  | 
						
							| 11 | 9 10 | rbsyl |  | 
						
							| 12 | 6 11 | rbsyl |  | 
						
							| 13 |  | rb-ax4 |  | 
						
							| 14 |  | rb-ax2 |  | 
						
							| 15 |  | rblem2 |  | 
						
							| 16 | 14 15 | rbsyl |  | 
						
							| 17 |  | rb-ax3 |  | 
						
							| 18 |  | rblem2 |  | 
						
							| 19 | 17 18 | anmp |  | 
						
							| 20 | 16 19 | rblem1 |  | 
						
							| 21 | 13 20 | rbsyl |  | 
						
							| 22 | 12 21 | rbsyl |  | 
						
							| 23 | 5 22 | rbsyl |  |