| Step | Hyp | Ref | Expression | 
						
							| 1 |  | merco1 |  | 
						
							| 2 |  | merco1lem17 |  | 
						
							| 3 | 1 2 | ax-mp |  | 
						
							| 4 |  | merco1lem17 |  | 
						
							| 5 | 3 4 | ax-mp |  | 
						
							| 6 |  | merco1lem5 |  | 
						
							| 7 |  | merco1lem3 |  | 
						
							| 8 | 6 7 | ax-mp |  | 
						
							| 9 |  | merco1lem5 |  | 
						
							| 10 | 8 9 | ax-mp |  | 
						
							| 11 |  | merco1lem4 |  | 
						
							| 12 | 10 11 | ax-mp |  | 
						
							| 13 |  | merco1 |  | 
						
							| 14 |  | merco1lem2 |  | 
						
							| 15 | 13 14 | ax-mp |  | 
						
							| 16 | 12 15 | ax-mp |  | 
						
							| 17 |  | merco1lem9 |  | 
						
							| 18 | 16 17 | ax-mp |  | 
						
							| 19 | 5 18 | ax-mp |  |