| 1: | a(f,a(g,a(f,x))) | → a(f,a(g,a(g,a(f,x)))) | |
| 2: | a(g,a(f,a(g,x))) | → a(g,a(f,a(f,a(g,x)))) | |
| 3: | A(f,a(g,a(f,x))) | → A(f,a(g,a(g,a(f,x)))) | |
| 4: | A(f,a(g,a(f,x))) | → A(g,a(g,a(f,x))) | |
| 5: | A(g,a(f,a(g,x))) | → A(g,a(f,a(f,a(g,x)))) | |
| 6: | A(g,a(f,a(g,x))) | → A(f,a(f,a(g,x))) | |