| Step | Hyp | Ref | Expression | 
						
							| 1 |  | latlej.b |  | 
						
							| 2 |  | latlej.l |  | 
						
							| 3 |  | latlej.j |  | 
						
							| 4 | 1 2 3 | latlej1 |  | 
						
							| 5 | 4 | 3adant3r1 |  | 
						
							| 6 |  | simpl |  | 
						
							| 7 |  | simpr1 |  | 
						
							| 8 |  | simpr2 |  | 
						
							| 9 | 1 3 | latjcl |  | 
						
							| 10 | 9 | 3adant3r1 |  | 
						
							| 11 | 1 2 | lattr |  | 
						
							| 12 | 6 7 8 10 11 | syl13anc |  | 
						
							| 13 | 5 12 | mpan2d |  | 
						
							| 14 | 13 | con3d |  | 
						
							| 15 | 1 2 3 | latlej2 |  | 
						
							| 16 | 15 | 3adant3r1 |  | 
						
							| 17 |  | simpr3 |  | 
						
							| 18 | 1 2 | lattr |  | 
						
							| 19 | 6 7 17 10 18 | syl13anc |  | 
						
							| 20 | 16 19 | mpan2d |  | 
						
							| 21 | 20 | con3d |  | 
						
							| 22 | 14 21 | jcad |  | 
						
							| 23 | 22 | 3impia |  |