| Step | Hyp | Ref | Expression | 
						
							| 1 |  | axrep6 |  | 
						
							| 2 |  | 19.37v |  | 
						
							| 3 |  | impexp |  | 
						
							| 4 | 3 | albii |  | 
						
							| 5 |  | 19.21v |  | 
						
							| 6 | 4 5 | bitri |  | 
						
							| 7 | 6 | exbii |  | 
						
							| 8 |  | df-mo |  | 
						
							| 9 | 8 | imbi2i |  | 
						
							| 10 | 2 7 9 | 3bitr4i |  | 
						
							| 11 | 10 | albii |  | 
						
							| 12 |  | df-mo |  | 
						
							| 13 | 12 | albii |  | 
						
							| 14 |  | df-ral |  | 
						
							| 15 | 11 13 14 | 3bitr4i |  | 
						
							| 16 |  | rexanid |  | 
						
							| 17 | 16 | bibi2i |  | 
						
							| 18 | 17 | albii |  | 
						
							| 19 | 18 | exbii |  | 
						
							| 20 | 1 15 19 | 3imtr3i |  |