| Step | Hyp | Ref | Expression | 
						
							| 1 |  | nfe1 |  | 
						
							| 2 |  | nfv |  | 
						
							| 3 |  | nfv |  | 
						
							| 4 |  | nfa1 |  | 
						
							| 5 | 3 4 | nfan |  | 
						
							| 6 | 5 | nfex |  | 
						
							| 7 | 2 6 | nfbi |  | 
						
							| 8 | 7 | nfal |  | 
						
							| 9 | 1 8 | nfim |  | 
						
							| 10 | 9 | nfex |  | 
						
							| 11 |  | elequ2 |  | 
						
							| 12 | 11 | anbi1d |  | 
						
							| 13 | 12 | exbidv |  | 
						
							| 14 | 13 | bibi2d |  | 
						
							| 15 | 14 | albidv |  | 
						
							| 16 | 15 | imbi2d |  | 
						
							| 17 | 16 | exbidv |  | 
						
							| 18 |  | axrepnd |  | 
						
							| 19 |  | 19.3v |  | 
						
							| 20 |  | 19.3v |  | 
						
							| 21 | 20 | anbi1i |  | 
						
							| 22 | 21 | exbii |  | 
						
							| 23 | 19 22 | bibi12i |  | 
						
							| 24 | 23 | albii |  | 
						
							| 25 | 24 | imbi2i |  | 
						
							| 26 | 25 | exbii |  | 
						
							| 27 | 18 26 | mpbi |  | 
						
							| 28 | 10 17 27 | chvar |  | 
						
							| 29 | 28 | 19.35i |  | 
						
							| 30 |  | nfv |  | 
						
							| 31 |  | nfe1 |  | 
						
							| 32 | 30 31 | nfbi |  | 
						
							| 33 | 32 | nfal |  | 
						
							| 34 |  | elequ2 |  | 
						
							| 35 |  | nfa1 |  | 
						
							| 36 | 35 | 19.3 |  | 
						
							| 37 | 36 | anbi2i |  | 
						
							| 38 | 37 | exbii |  | 
						
							| 39 | 38 | a1i |  | 
						
							| 40 | 34 39 | bibi12d |  | 
						
							| 41 | 40 | albidv |  | 
						
							| 42 | 8 33 41 | cbvexv1 |  | 
						
							| 43 | 29 42 | sylib |  |