| Step | Hyp | Ref | Expression | 
						
							| 1 |  | ralxp3f.1 |  | 
						
							| 2 |  | ralxp3f.2 |  | 
						
							| 3 |  | ralxp3f.3 |  | 
						
							| 4 |  | ralxp3f.4 |  | 
						
							| 5 |  | ralxp3f.5 |  | 
						
							| 6 |  | df-ral |  | 
						
							| 7 |  | el2xptp |  | 
						
							| 8 | 7 | imbi1i |  | 
						
							| 9 | 3 | r19.23 |  | 
						
							| 10 | 9 | ralbii |  | 
						
							| 11 | 2 | r19.23 |  | 
						
							| 12 | 10 11 | bitri |  | 
						
							| 13 | 12 | ralbii |  | 
						
							| 14 | 1 | r19.23 |  | 
						
							| 15 | 13 14 | bitr2i |  | 
						
							| 16 | 8 15 | bitri |  | 
						
							| 17 | 16 | albii |  | 
						
							| 18 |  | ralcom4 |  | 
						
							| 19 |  | ralcom4 |  | 
						
							| 20 |  | ralcom4 |  | 
						
							| 21 |  | otex |  | 
						
							| 22 | 4 21 5 | ceqsal |  | 
						
							| 23 | 22 | ralbii |  | 
						
							| 24 | 20 23 | bitr3i |  | 
						
							| 25 | 24 | ralbii |  | 
						
							| 26 | 19 25 | bitr3i |  | 
						
							| 27 | 26 | ralbii |  | 
						
							| 28 | 18 27 | bitr3i |  | 
						
							| 29 | 6 17 28 | 3bitri |  |