| Step | Hyp | Ref | Expression | 
						
							| 1 |  | tglngval.p |  | 
						
							| 2 |  | tglngval.l |  | 
						
							| 3 |  | tglngval.i |  | 
						
							| 4 |  | tglngval.g |  | 
						
							| 5 |  | tglngval.x |  | 
						
							| 6 |  | tglngval.y |  | 
						
							| 7 |  | tgcolg.z |  | 
						
							| 8 |  | colrot |  | 
						
							| 9 |  | 3orrot |  | 
						
							| 10 |  | eqid |  | 
						
							| 11 | 1 10 3 4 7 5 6 | tgbtwncomb |  | 
						
							| 12 |  | biidd |  | 
						
							| 13 | 1 10 3 4 5 7 6 | tgbtwncomb |  | 
						
							| 14 | 11 12 13 | 3orbi123d |  | 
						
							| 15 | 9 14 | bitrid |  | 
						
							| 16 | 1 2 3 4 5 6 7 | tgcolg |  | 
						
							| 17 | 1 2 3 4 6 7 5 | tgcolg |  | 
						
							| 18 | 15 16 17 | 3bitr4d |  | 
						
							| 19 | 8 18 | mpbid |  |