| Step | Hyp | Ref | Expression | 
						
							| 1 |  | 4at.l |  | 
						
							| 2 |  | 4at.j |  | 
						
							| 3 |  | 4at.a |  | 
						
							| 4 |  | simp11 |  | 
						
							| 5 |  | simp21 |  | 
						
							| 6 |  | simp22 |  | 
						
							| 7 | 4 | hllatd |  | 
						
							| 8 |  | simp1 |  | 
						
							| 9 |  | eqid |  | 
						
							| 10 | 9 2 3 | hlatjcl |  | 
						
							| 11 | 8 10 | syl |  | 
						
							| 12 |  | simp23 |  | 
						
							| 13 | 9 3 | atbase |  | 
						
							| 14 | 12 13 | syl |  | 
						
							| 15 | 9 2 | latjcl |  | 
						
							| 16 | 7 11 14 15 | syl3anc |  | 
						
							| 17 |  | simp3 |  | 
						
							| 18 | 9 1 2 3 | hlexchb2 |  | 
						
							| 19 | 4 5 6 16 17 18 | syl131anc |  | 
						
							| 20 | 1 2 3 | 4atlem4c |  | 
						
							| 21 | 8 6 12 20 | syl12anc |  | 
						
							| 22 | 21 | breq2d |  | 
						
							| 23 | 1 2 3 | 4atlem4c |  | 
						
							| 24 | 8 5 12 23 | syl12anc |  | 
						
							| 25 | 24 21 | eqeq12d |  | 
						
							| 26 | 19 22 25 | 3bitr4d |  |