MAYBE

Problem:
 app(app(app(comp(),f),g),x) -> app(f,app(g,x))
 app(twice(),f) -> app(app(comp(),f),f)

Proof:
 DP Processor:
  DPs:
   app#(app(app(comp(),f),g),x) -> app#(g,x)
   app#(app(app(comp(),f),g),x) -> app#(f,app(g,x))
   app#(twice(),f) -> app#(comp(),f)
   app#(twice(),f) -> app#(app(comp(),f),f)
  TRS:
   app(app(app(comp(),f),g),x) -> app(f,app(g,x))
   app(twice(),f) -> app(app(comp(),f),f)
  Open