|  | 
| 1: |  | app(app(app(fold,f),x),nil) | → x | 
| 2: |  | app(app(app(fold,f),x),app(app(cons,y),z)) | → app(app(f,y),app(app(app(fold,f),x),z)) | 
| 3: |  | app(app(plus,0),y) | → y | 
| 4: |  | app(app(plus,app(s,x)),y) | → app(s,app(app(plus,x),y)) | 
| 5: |  | app(app(times,0),y) | → 0 | 
| 6: |  | app(app(times,app(s,x)),y) | → app(app(plus,app(app(times,x),y)),y) | 
| 7: |  | sum | → app(app(fold,add),0) | 
| 8: |  | prod | → app(app(fold,mul),app(s,0)) | 
|  | 
There are 15 dependency pairs:
|  | 
| 9: |  | APP(app(app(fold,f),x),app(app(cons,y),z)) | → APP(app(f,y),app(app(app(fold,f),x),z)) | 
| 10: |  | APP(app(app(fold,f),x),app(app(cons,y),z)) | → APP(f,y) | 
| 11: |  | APP(app(app(fold,f),x),app(app(cons,y),z)) | → APP(app(app(fold,f),x),z) | 
| 12: |  | APP(app(plus,app(s,x)),y) | → APP(s,app(app(plus,x),y)) | 
| 13: |  | APP(app(plus,app(s,x)),y) | → APP(app(plus,x),y) | 
| 14: |  | APP(app(plus,app(s,x)),y) | → APP(plus,x) | 
| 15: |  | APP(app(times,app(s,x)),y) | → APP(app(plus,app(app(times,x),y)),y) | 
| 16: |  | APP(app(times,app(s,x)),y) | → APP(plus,app(app(times,x),y)) | 
| 17: |  | APP(app(times,app(s,x)),y) | → APP(app(times,x),y) | 
| 18: |  | APP(app(times,app(s,x)),y) | → APP(times,x) | 
| 19: |  | SUM | → APP(app(fold,add),0) | 
| 20: |  | SUM | → APP(fold,add) | 
| 21: |  | PROD | → APP(app(fold,mul),app(s,0)) | 
| 22: |  | PROD | → APP(fold,mul) | 
| 23: |  | PROD | → APP(s,0) | 
|  | 
The approximated dependency graph contains one SCC:
{9-11,13,15,17}.