YES

Problem:
 app(perfectp(),0()) -> false()
 app(perfectp(),app(s(),x)) -> app(app(app(app(f(),x),app(s(),0())),app(s(),x)),app(s(),x))
 app(app(app(app(f(),0()),y),0()),u) -> true()
 app(app(app(app(f(),0()),y),app(s(),z)),u) -> false()
 app(app(app(app(f(),app(s(),x)),0()),z),u) ->
 app(app(app(app(f(),x),u),app(app(minus(),z),app(s(),x))),u)
 app(app(app(app(f(),app(s(),x)),app(s(),y)),z),u) ->
 app(app(app(if(),app(app(le(),x),y)),app(app(app(app(f(),app(s(),x)),app(app(minus(),y),x)),z),u)),
     app(app(app(app(f(),x),u),z),u))
 app(app(map(),fun),nil()) -> nil()
 app(app(map(),fun),app(app(cons(),x),xs)) -> app(app(cons(),app(fun,x)),app(app(map(),fun),xs))
 app(app(filter(),fun),nil()) -> nil()
 app(app(filter(),fun),app(app(cons(),x),xs)) -> app(app(app(app(filter2(),app(fun,x)),fun),x),xs)
 app(app(app(app(filter2(),true()),fun),x),xs) -> app(app(cons(),x),app(app(filter(),fun),xs))
 app(app(app(app(filter2(),false()),fun),x),xs) -> app(app(filter(),fun),xs)

Proof:
 Uncurry Processor:
  perfectp1(0()) -> false()
  perfectp1(s1(x)) -> f4(x,s1(0()),s1(x),s1(x))
  f4(0(),y,0(),u) -> true()
  f4(0(),y,s1(z),u) -> false()
  f4(s1(x),0(),z,u) -> f4(x,u,minus2(z,s1(x)),u)
  f4(s1(x),s1(y),z,u) -> if3(le2(x,y),f4(s1(x),minus2(y,x),z,u),f4(x,u,z,u))
  map2(fun,nil()) -> nil()
  map2(fun,cons2(x,xs)) -> cons2(app(fun,x),map2(fun,xs))
  filter2(fun,nil()) -> nil()
  filter2(fun,cons2(x,xs)) -> filter24(app(fun,x),fun,x,xs)
  filter24(true(),fun,x,xs) -> cons2(x,filter2(fun,xs))
  filter24(false(),fun,x,xs) -> filter2(fun,xs)
  app(perfectp(),x9) -> perfectp1(x9)
  app(s(),x9) -> s1(x9)
  app(f3(x8,x7,x6),x9) -> f4(x8,x7,x6,x9)
  app(f2(x8,x7),x9) -> f3(x8,x7,x9)
  app(f1(x8),x9) -> f2(x8,x9)
  app(f(),x9) -> f1(x9)
  app(minus1(x8),x9) -> minus2(x8,x9)
  app(minus(),x9) -> minus1(x9)
  app(if2(x8,x7),x9) -> if3(x8,x7,x9)
  app(if1(x8),x9) -> if2(x8,x9)
  app(if(),x9) -> if1(x9)
  app(le1(x8),x9) -> le2(x8,x9)
  app(le(),x9) -> le1(x9)
  app(map1(x8),x9) -> map2(x8,x9)
  app(map(),x9) -> map1(x9)
  app(cons1(x8),x9) -> cons2(x8,x9)
  app(cons(),x9) -> cons1(x9)
  app(filter1(x8),x9) -> filter2(x8,x9)
  app(filter(),x9) -> filter1(x9)
  app(filter23(x8,x7,x6),x9) -> filter24(x8,x7,x6,x9)
  app(filter22(x8,x7),x9) -> filter23(x8,x7,x9)
  app(filter21(x8),x9) -> filter22(x8,x9)
  app(filter2(),x9) -> filter21(x9)
  DP Processor:
   DPs:
    perfectp{1,#}(s1(x)) -> f{4,#}(x,s1(0()),s1(x),s1(x))
    f{4,#}(s1(x),0(),z,u) -> f{4,#}(x,u,minus2(z,s1(x)),u)
    f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(x,u,z,u)
    f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(s1(x),minus2(y,x),z,u)
    map{2,#}(fun,cons2(x,xs)) -> map{2,#}(fun,xs)
    map{2,#}(fun,cons2(x,xs)) -> app#(fun,x)
    filter{2,#}(fun,cons2(x,xs)) -> app#(fun,x)
    filter{2,#}(fun,cons2(x,xs)) -> filter2{4,#}(app(fun,x),fun,x,xs)
    filter2{4,#}(true(),fun,x,xs) -> filter{2,#}(fun,xs)
    filter2{4,#}(false(),fun,x,xs) -> filter{2,#}(fun,xs)
    app#(perfectp(),x9) -> perfectp{1,#}(x9)
    app#(f3(x8,x7,x6),x9) -> f{4,#}(x8,x7,x6,x9)
    app#(map1(x8),x9) -> map{2,#}(x8,x9)
    app#(filter1(x8),x9) -> filter{2,#}(x8,x9)
    app#(filter23(x8,x7,x6),x9) -> filter2{4,#}(x8,x7,x6,x9)
   TRS:
    perfectp1(0()) -> false()
    perfectp1(s1(x)) -> f4(x,s1(0()),s1(x),s1(x))
    f4(0(),y,0(),u) -> true()
    f4(0(),y,s1(z),u) -> false()
    f4(s1(x),0(),z,u) -> f4(x,u,minus2(z,s1(x)),u)
    f4(s1(x),s1(y),z,u) -> if3(le2(x,y),f4(s1(x),minus2(y,x),z,u),f4(x,u,z,u))
    map2(fun,nil()) -> nil()
    map2(fun,cons2(x,xs)) -> cons2(app(fun,x),map2(fun,xs))
    filter2(fun,nil()) -> nil()
    filter2(fun,cons2(x,xs)) -> filter24(app(fun,x),fun,x,xs)
    filter24(true(),fun,x,xs) -> cons2(x,filter2(fun,xs))
    filter24(false(),fun,x,xs) -> filter2(fun,xs)
    app(perfectp(),x9) -> perfectp1(x9)
    app(s(),x9) -> s1(x9)
    app(f3(x8,x7,x6),x9) -> f4(x8,x7,x6,x9)
    app(f2(x8,x7),x9) -> f3(x8,x7,x9)
    app(f1(x8),x9) -> f2(x8,x9)
    app(f(),x9) -> f1(x9)
    app(minus1(x8),x9) -> minus2(x8,x9)
    app(minus(),x9) -> minus1(x9)
    app(if2(x8,x7),x9) -> if3(x8,x7,x9)
    app(if1(x8),x9) -> if2(x8,x9)
    app(if(),x9) -> if1(x9)
    app(le1(x8),x9) -> le2(x8,x9)
    app(le(),x9) -> le1(x9)
    app(map1(x8),x9) -> map2(x8,x9)
    app(map(),x9) -> map1(x9)
    app(cons1(x8),x9) -> cons2(x8,x9)
    app(cons(),x9) -> cons1(x9)
    app(filter1(x8),x9) -> filter2(x8,x9)
    app(filter(),x9) -> filter1(x9)
    app(filter23(x8,x7,x6),x9) -> filter24(x8,x7,x6,x9)
    app(filter22(x8,x7),x9) -> filter23(x8,x7,x9)
    app(filter21(x8),x9) -> filter22(x8,x9)
    app(filter2(),x9) -> filter21(x9)
   TDG Processor:
    DPs:
     perfectp{1,#}(s1(x)) -> f{4,#}(x,s1(0()),s1(x),s1(x))
     f{4,#}(s1(x),0(),z,u) -> f{4,#}(x,u,minus2(z,s1(x)),u)
     f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(x,u,z,u)
     f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(s1(x),minus2(y,x),z,u)
     map{2,#}(fun,cons2(x,xs)) -> map{2,#}(fun,xs)
     map{2,#}(fun,cons2(x,xs)) -> app#(fun,x)
     filter{2,#}(fun,cons2(x,xs)) -> app#(fun,x)
     filter{2,#}(fun,cons2(x,xs)) -> filter2{4,#}(app(fun,x),fun,x,xs)
     filter2{4,#}(true(),fun,x,xs) -> filter{2,#}(fun,xs)
     filter2{4,#}(false(),fun,x,xs) -> filter{2,#}(fun,xs)
     app#(perfectp(),x9) -> perfectp{1,#}(x9)
     app#(f3(x8,x7,x6),x9) -> f{4,#}(x8,x7,x6,x9)
     app#(map1(x8),x9) -> map{2,#}(x8,x9)
     app#(filter1(x8),x9) -> filter{2,#}(x8,x9)
     app#(filter23(x8,x7,x6),x9) -> filter2{4,#}(x8,x7,x6,x9)
    TRS:
     perfectp1(0()) -> false()
     perfectp1(s1(x)) -> f4(x,s1(0()),s1(x),s1(x))
     f4(0(),y,0(),u) -> true()
     f4(0(),y,s1(z),u) -> false()
     f4(s1(x),0(),z,u) -> f4(x,u,minus2(z,s1(x)),u)
     f4(s1(x),s1(y),z,u) -> if3(le2(x,y),f4(s1(x),minus2(y,x),z,u),f4(x,u,z,u))
     map2(fun,nil()) -> nil()
     map2(fun,cons2(x,xs)) -> cons2(app(fun,x),map2(fun,xs))
     filter2(fun,nil()) -> nil()
     filter2(fun,cons2(x,xs)) -> filter24(app(fun,x),fun,x,xs)
     filter24(true(),fun,x,xs) -> cons2(x,filter2(fun,xs))
     filter24(false(),fun,x,xs) -> filter2(fun,xs)
     app(perfectp(),x9) -> perfectp1(x9)
     app(s(),x9) -> s1(x9)
     app(f3(x8,x7,x6),x9) -> f4(x8,x7,x6,x9)
     app(f2(x8,x7),x9) -> f3(x8,x7,x9)
     app(f1(x8),x9) -> f2(x8,x9)
     app(f(),x9) -> f1(x9)
     app(minus1(x8),x9) -> minus2(x8,x9)
     app(minus(),x9) -> minus1(x9)
     app(if2(x8,x7),x9) -> if3(x8,x7,x9)
     app(if1(x8),x9) -> if2(x8,x9)
     app(if(),x9) -> if1(x9)
     app(le1(x8),x9) -> le2(x8,x9)
     app(le(),x9) -> le1(x9)
     app(map1(x8),x9) -> map2(x8,x9)
     app(map(),x9) -> map1(x9)
     app(cons1(x8),x9) -> cons2(x8,x9)
     app(cons(),x9) -> cons1(x9)
     app(filter1(x8),x9) -> filter2(x8,x9)
     app(filter(),x9) -> filter1(x9)
     app(filter23(x8,x7,x6),x9) -> filter24(x8,x7,x6,x9)
     app(filter22(x8,x7),x9) -> filter23(x8,x7,x9)
     app(filter21(x8),x9) -> filter22(x8,x9)
     app(filter2(),x9) -> filter21(x9)
    graph:
     filter2{4,#}(true(),fun,x,xs) -> filter{2,#}(fun,xs) ->
     filter{2,#}(fun,cons2(x,xs)) -> filter2{4,#}(app(fun,x),fun,x,xs)
     filter2{4,#}(true(),fun,x,xs) -> filter{2,#}(fun,xs) ->
     filter{2,#}(fun,cons2(x,xs)) -> app#(fun,x)
     filter2{4,#}(false(),fun,x,xs) -> filter{2,#}(fun,xs) ->
     filter{2,#}(fun,cons2(x,xs)) -> filter2{4,#}(app(fun,x),fun,x,xs)
     filter2{4,#}(false(),fun,x,xs) -> filter{2,#}(fun,xs) ->
     filter{2,#}(fun,cons2(x,xs)) -> app#(fun,x)
     filter{2,#}(fun,cons2(x,xs)) -> filter2{4,#}(app(fun,x),fun,x,xs) ->
     filter2{4,#}(false(),fun,x,xs) -> filter{2,#}(fun,xs)
     filter{2,#}(fun,cons2(x,xs)) -> filter2{4,#}(app(fun,x),fun,x,xs) ->
     filter2{4,#}(true(),fun,x,xs) -> filter{2,#}(fun,xs)
     filter{2,#}(fun,cons2(x,xs)) -> app#(fun,x) ->
     app#(filter23(x8,x7,x6),x9) -> filter2{4,#}(x8,x7,x6,x9)
     filter{2,#}(fun,cons2(x,xs)) -> app#(fun,x) ->
     app#(filter1(x8),x9) -> filter{2,#}(x8,x9)
     filter{2,#}(fun,cons2(x,xs)) -> app#(fun,x) ->
     app#(map1(x8),x9) -> map{2,#}(x8,x9)
     filter{2,#}(fun,cons2(x,xs)) -> app#(fun,x) ->
     app#(f3(x8,x7,x6),x9) -> f{4,#}(x8,x7,x6,x9)
     filter{2,#}(fun,cons2(x,xs)) -> app#(fun,x) ->
     app#(perfectp(),x9) -> perfectp{1,#}(x9)
     app#(filter23(x8,x7,x6),x9) -> filter2{4,#}(x8,x7,x6,x9) ->
     filter2{4,#}(false(),fun,x,xs) -> filter{2,#}(fun,xs)
     app#(filter23(x8,x7,x6),x9) -> filter2{4,#}(x8,x7,x6,x9) ->
     filter2{4,#}(true(),fun,x,xs) -> filter{2,#}(fun,xs)
     app#(filter1(x8),x9) -> filter{2,#}(x8,x9) ->
     filter{2,#}(fun,cons2(x,xs)) -> filter2{4,#}(app(fun,x),fun,x,xs)
     app#(filter1(x8),x9) -> filter{2,#}(x8,x9) ->
     filter{2,#}(fun,cons2(x,xs)) -> app#(fun,x)
     app#(map1(x8),x9) -> map{2,#}(x8,x9) ->
     map{2,#}(fun,cons2(x,xs)) -> app#(fun,x)
     app#(map1(x8),x9) -> map{2,#}(x8,x9) ->
     map{2,#}(fun,cons2(x,xs)) -> map{2,#}(fun,xs)
     app#(f3(x8,x7,x6),x9) -> f{4,#}(x8,x7,x6,x9) ->
     f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(s1(x),minus2(y,x),z,u)
     app#(f3(x8,x7,x6),x9) -> f{4,#}(x8,x7,x6,x9) ->
     f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(x,u,z,u)
     app#(f3(x8,x7,x6),x9) -> f{4,#}(x8,x7,x6,x9) ->
     f{4,#}(s1(x),0(),z,u) -> f{4,#}(x,u,minus2(z,s1(x)),u)
     app#(perfectp(),x9) -> perfectp{1,#}(x9) ->
     perfectp{1,#}(s1(x)) -> f{4,#}(x,s1(0()),s1(x),s1(x))
     map{2,#}(fun,cons2(x,xs)) -> app#(fun,x) ->
     app#(filter23(x8,x7,x6),x9) -> filter2{4,#}(x8,x7,x6,x9)
     map{2,#}(fun,cons2(x,xs)) -> app#(fun,x) ->
     app#(filter1(x8),x9) -> filter{2,#}(x8,x9)
     map{2,#}(fun,cons2(x,xs)) -> app#(fun,x) ->
     app#(map1(x8),x9) -> map{2,#}(x8,x9)
     map{2,#}(fun,cons2(x,xs)) -> app#(fun,x) ->
     app#(f3(x8,x7,x6),x9) -> f{4,#}(x8,x7,x6,x9)
     map{2,#}(fun,cons2(x,xs)) -> app#(fun,x) ->
     app#(perfectp(),x9) -> perfectp{1,#}(x9)
     map{2,#}(fun,cons2(x,xs)) -> map{2,#}(fun,xs) ->
     map{2,#}(fun,cons2(x,xs)) -> app#(fun,x)
     map{2,#}(fun,cons2(x,xs)) -> map{2,#}(fun,xs) ->
     map{2,#}(fun,cons2(x,xs)) -> map{2,#}(fun,xs)
     f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(s1(x),minus2(y,x),z,u) ->
     f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(s1(x),minus2(y,x),z,u)
     f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(s1(x),minus2(y,x),z,u) ->
     f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(x,u,z,u)
     f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(s1(x),minus2(y,x),z,u) ->
     f{4,#}(s1(x),0(),z,u) -> f{4,#}(x,u,minus2(z,s1(x)),u)
     f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(x,u,z,u) ->
     f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(s1(x),minus2(y,x),z,u)
     f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(x,u,z,u) ->
     f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(x,u,z,u)
     f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(x,u,z,u) ->
     f{4,#}(s1(x),0(),z,u) -> f{4,#}(x,u,minus2(z,s1(x)),u)
     f{4,#}(s1(x),0(),z,u) -> f{4,#}(x,u,minus2(z,s1(x)),u) ->
     f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(s1(x),minus2(y,x),z,u)
     f{4,#}(s1(x),0(),z,u) -> f{4,#}(x,u,minus2(z,s1(x)),u) ->
     f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(x,u,z,u)
     f{4,#}(s1(x),0(),z,u) -> f{4,#}(x,u,minus2(z,s1(x)),u) ->
     f{4,#}(s1(x),0(),z,u) -> f{4,#}(x,u,minus2(z,s1(x)),u)
     perfectp{1,#}(s1(x)) -> f{4,#}(x,s1(0()),s1(x),s1(x)) ->
     f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(s1(x),minus2(y,x),z,u)
     perfectp{1,#}(s1(x)) -> f{4,#}(x,s1(0()),s1(x),s1(x)) ->
     f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(x,u,z,u)
     perfectp{1,#}(s1(x)) -> f{4,#}(x,s1(0()),s1(x),s1(x)) ->
     f{4,#}(s1(x),0(),z,u) -> f{4,#}(x,u,minus2(z,s1(x)),u)
    SCC Processor:
     #sccs: 2
     #rules: 12
     #arcs: 40/225
     DPs:
      filter2{4,#}(true(),fun,x,xs) -> filter{2,#}(fun,xs)
      filter{2,#}(fun,cons2(x,xs)) -> app#(fun,x)
      app#(map1(x8),x9) -> map{2,#}(x8,x9)
      map{2,#}(fun,cons2(x,xs)) -> map{2,#}(fun,xs)
      map{2,#}(fun,cons2(x,xs)) -> app#(fun,x)
      app#(filter1(x8),x9) -> filter{2,#}(x8,x9)
      filter{2,#}(fun,cons2(x,xs)) -> filter2{4,#}(app(fun,x),fun,x,xs)
      filter2{4,#}(false(),fun,x,xs) -> filter{2,#}(fun,xs)
      app#(filter23(x8,x7,x6),x9) -> filter2{4,#}(x8,x7,x6,x9)
     TRS:
      perfectp1(0()) -> false()
      perfectp1(s1(x)) -> f4(x,s1(0()),s1(x),s1(x))
      f4(0(),y,0(),u) -> true()
      f4(0(),y,s1(z),u) -> false()
      f4(s1(x),0(),z,u) -> f4(x,u,minus2(z,s1(x)),u)
      f4(s1(x),s1(y),z,u) -> if3(le2(x,y),f4(s1(x),minus2(y,x),z,u),f4(x,u,z,u))
      map2(fun,nil()) -> nil()
      map2(fun,cons2(x,xs)) -> cons2(app(fun,x),map2(fun,xs))
      filter2(fun,nil()) -> nil()
      filter2(fun,cons2(x,xs)) -> filter24(app(fun,x),fun,x,xs)
      filter24(true(),fun,x,xs) -> cons2(x,filter2(fun,xs))
      filter24(false(),fun,x,xs) -> filter2(fun,xs)
      app(perfectp(),x9) -> perfectp1(x9)
      app(s(),x9) -> s1(x9)
      app(f3(x8,x7,x6),x9) -> f4(x8,x7,x6,x9)
      app(f2(x8,x7),x9) -> f3(x8,x7,x9)
      app(f1(x8),x9) -> f2(x8,x9)
      app(f(),x9) -> f1(x9)
      app(minus1(x8),x9) -> minus2(x8,x9)
      app(minus(),x9) -> minus1(x9)
      app(if2(x8,x7),x9) -> if3(x8,x7,x9)
      app(if1(x8),x9) -> if2(x8,x9)
      app(if(),x9) -> if1(x9)
      app(le1(x8),x9) -> le2(x8,x9)
      app(le(),x9) -> le1(x9)
      app(map1(x8),x9) -> map2(x8,x9)
      app(map(),x9) -> map1(x9)
      app(cons1(x8),x9) -> cons2(x8,x9)
      app(cons(),x9) -> cons1(x9)
      app(filter1(x8),x9) -> filter2(x8,x9)
      app(filter(),x9) -> filter1(x9)
      app(filter23(x8,x7,x6),x9) -> filter24(x8,x7,x6,x9)
      app(filter22(x8,x7),x9) -> filter23(x8,x7,x9)
      app(filter21(x8),x9) -> filter22(x8,x9)
      app(filter2(),x9) -> filter21(x9)
     Subterm Criterion Processor:
      simple projection:
       pi(map{2,#}) = 1
       pi(app#) = 1
       pi(filter{2,#}) = 1
       pi(filter2{4,#}) = 3
      problem:
       DPs:
        filter2{4,#}(true(),fun,x,xs) -> filter{2,#}(fun,xs)
        app#(map1(x8),x9) -> map{2,#}(x8,x9)
        app#(filter1(x8),x9) -> filter{2,#}(x8,x9)
        filter2{4,#}(false(),fun,x,xs) -> filter{2,#}(fun,xs)
        app#(filter23(x8,x7,x6),x9) -> filter2{4,#}(x8,x7,x6,x9)
       TRS:
        perfectp1(0()) -> false()
        perfectp1(s1(x)) -> f4(x,s1(0()),s1(x),s1(x))
        f4(0(),y,0(),u) -> true()
        f4(0(),y,s1(z),u) -> false()
        f4(s1(x),0(),z,u) -> f4(x,u,minus2(z,s1(x)),u)
        f4(s1(x),s1(y),z,u) -> if3(le2(x,y),f4(s1(x),minus2(y,x),z,u),f4(x,u,z,u))
        map2(fun,nil()) -> nil()
        map2(fun,cons2(x,xs)) -> cons2(app(fun,x),map2(fun,xs))
        filter2(fun,nil()) -> nil()
        filter2(fun,cons2(x,xs)) -> filter24(app(fun,x),fun,x,xs)
        filter24(true(),fun,x,xs) -> cons2(x,filter2(fun,xs))
        filter24(false(),fun,x,xs) -> filter2(fun,xs)
        app(perfectp(),x9) -> perfectp1(x9)
        app(s(),x9) -> s1(x9)
        app(f3(x8,x7,x6),x9) -> f4(x8,x7,x6,x9)
        app(f2(x8,x7),x9) -> f3(x8,x7,x9)
        app(f1(x8),x9) -> f2(x8,x9)
        app(f(),x9) -> f1(x9)
        app(minus1(x8),x9) -> minus2(x8,x9)
        app(minus(),x9) -> minus1(x9)
        app(if2(x8,x7),x9) -> if3(x8,x7,x9)
        app(if1(x8),x9) -> if2(x8,x9)
        app(if(),x9) -> if1(x9)
        app(le1(x8),x9) -> le2(x8,x9)
        app(le(),x9) -> le1(x9)
        app(map1(x8),x9) -> map2(x8,x9)
        app(map(),x9) -> map1(x9)
        app(cons1(x8),x9) -> cons2(x8,x9)
        app(cons(),x9) -> cons1(x9)
        app(filter1(x8),x9) -> filter2(x8,x9)
        app(filter(),x9) -> filter1(x9)
        app(filter23(x8,x7,x6),x9) -> filter24(x8,x7,x6,x9)
        app(filter22(x8,x7),x9) -> filter23(x8,x7,x9)
        app(filter21(x8),x9) -> filter22(x8,x9)
        app(filter2(),x9) -> filter21(x9)
      SCC Processor:
       #sccs: 0
       #rules: 0
       #arcs: 20/25
       
     
     DPs:
      f{4,#}(s1(x),0(),z,u) -> f{4,#}(x,u,minus2(z,s1(x)),u)
      f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(x,u,z,u)
      f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(s1(x),minus2(y,x),z,u)
     TRS:
      perfectp1(0()) -> false()
      perfectp1(s1(x)) -> f4(x,s1(0()),s1(x),s1(x))
      f4(0(),y,0(),u) -> true()
      f4(0(),y,s1(z),u) -> false()
      f4(s1(x),0(),z,u) -> f4(x,u,minus2(z,s1(x)),u)
      f4(s1(x),s1(y),z,u) -> if3(le2(x,y),f4(s1(x),minus2(y,x),z,u),f4(x,u,z,u))
      map2(fun,nil()) -> nil()
      map2(fun,cons2(x,xs)) -> cons2(app(fun,x),map2(fun,xs))
      filter2(fun,nil()) -> nil()
      filter2(fun,cons2(x,xs)) -> filter24(app(fun,x),fun,x,xs)
      filter24(true(),fun,x,xs) -> cons2(x,filter2(fun,xs))
      filter24(false(),fun,x,xs) -> filter2(fun,xs)
      app(perfectp(),x9) -> perfectp1(x9)
      app(s(),x9) -> s1(x9)
      app(f3(x8,x7,x6),x9) -> f4(x8,x7,x6,x9)
      app(f2(x8,x7),x9) -> f3(x8,x7,x9)
      app(f1(x8),x9) -> f2(x8,x9)
      app(f(),x9) -> f1(x9)
      app(minus1(x8),x9) -> minus2(x8,x9)
      app(minus(),x9) -> minus1(x9)
      app(if2(x8,x7),x9) -> if3(x8,x7,x9)
      app(if1(x8),x9) -> if2(x8,x9)
      app(if(),x9) -> if1(x9)
      app(le1(x8),x9) -> le2(x8,x9)
      app(le(),x9) -> le1(x9)
      app(map1(x8),x9) -> map2(x8,x9)
      app(map(),x9) -> map1(x9)
      app(cons1(x8),x9) -> cons2(x8,x9)
      app(cons(),x9) -> cons1(x9)
      app(filter1(x8),x9) -> filter2(x8,x9)
      app(filter(),x9) -> filter1(x9)
      app(filter23(x8,x7,x6),x9) -> filter24(x8,x7,x6,x9)
      app(filter22(x8,x7),x9) -> filter23(x8,x7,x9)
      app(filter21(x8),x9) -> filter22(x8,x9)
      app(filter2(),x9) -> filter21(x9)
     Subterm Criterion Processor:
      simple projection:
       pi(f{4,#}) = 0
      problem:
       DPs:
        f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(s1(x),minus2(y,x),z,u)
       TRS:
        perfectp1(0()) -> false()
        perfectp1(s1(x)) -> f4(x,s1(0()),s1(x),s1(x))
        f4(0(),y,0(),u) -> true()
        f4(0(),y,s1(z),u) -> false()
        f4(s1(x),0(),z,u) -> f4(x,u,minus2(z,s1(x)),u)
        f4(s1(x),s1(y),z,u) -> if3(le2(x,y),f4(s1(x),minus2(y,x),z,u),f4(x,u,z,u))
        map2(fun,nil()) -> nil()
        map2(fun,cons2(x,xs)) -> cons2(app(fun,x),map2(fun,xs))
        filter2(fun,nil()) -> nil()
        filter2(fun,cons2(x,xs)) -> filter24(app(fun,x),fun,x,xs)
        filter24(true(),fun,x,xs) -> cons2(x,filter2(fun,xs))
        filter24(false(),fun,x,xs) -> filter2(fun,xs)
        app(perfectp(),x9) -> perfectp1(x9)
        app(s(),x9) -> s1(x9)
        app(f3(x8,x7,x6),x9) -> f4(x8,x7,x6,x9)
        app(f2(x8,x7),x9) -> f3(x8,x7,x9)
        app(f1(x8),x9) -> f2(x8,x9)
        app(f(),x9) -> f1(x9)
        app(minus1(x8),x9) -> minus2(x8,x9)
        app(minus(),x9) -> minus1(x9)
        app(if2(x8,x7),x9) -> if3(x8,x7,x9)
        app(if1(x8),x9) -> if2(x8,x9)
        app(if(),x9) -> if1(x9)
        app(le1(x8),x9) -> le2(x8,x9)
        app(le(),x9) -> le1(x9)
        app(map1(x8),x9) -> map2(x8,x9)
        app(map(),x9) -> map1(x9)
        app(cons1(x8),x9) -> cons2(x8,x9)
        app(cons(),x9) -> cons1(x9)
        app(filter1(x8),x9) -> filter2(x8,x9)
        app(filter(),x9) -> filter1(x9)
        app(filter23(x8,x7,x6),x9) -> filter24(x8,x7,x6,x9)
        app(filter22(x8,x7),x9) -> filter23(x8,x7,x9)
        app(filter21(x8),x9) -> filter22(x8,x9)
        app(filter2(),x9) -> filter21(x9)
      EDG Processor:
       DPs:
        f{4,#}(s1(x),s1(y),z,u) -> f{4,#}(s1(x),minus2(y,x),z,u)
       TRS:
        perfectp1(0()) -> false()
        perfectp1(s1(x)) -> f4(x,s1(0()),s1(x),s1(x))
        f4(0(),y,0(),u) -> true()
        f4(0(),y,s1(z),u) -> false()
        f4(s1(x),0(),z,u) -> f4(x,u,minus2(z,s1(x)),u)
        f4(s1(x),s1(y),z,u) -> if3(le2(x,y),f4(s1(x),minus2(y,x),z,u),f4(x,u,z,u))
        map2(fun,nil()) -> nil()
        map2(fun,cons2(x,xs)) -> cons2(app(fun,x),map2(fun,xs))
        filter2(fun,nil()) -> nil()
        filter2(fun,cons2(x,xs)) -> filter24(app(fun,x),fun,x,xs)
        filter24(true(),fun,x,xs) -> cons2(x,filter2(fun,xs))
        filter24(false(),fun,x,xs) -> filter2(fun,xs)
        app(perfectp(),x9) -> perfectp1(x9)
        app(s(),x9) -> s1(x9)
        app(f3(x8,x7,x6),x9) -> f4(x8,x7,x6,x9)
        app(f2(x8,x7),x9) -> f3(x8,x7,x9)
        app(f1(x8),x9) -> f2(x8,x9)
        app(f(),x9) -> f1(x9)
        app(minus1(x8),x9) -> minus2(x8,x9)
        app(minus(),x9) -> minus1(x9)
        app(if2(x8,x7),x9) -> if3(x8,x7,x9)
        app(if1(x8),x9) -> if2(x8,x9)
        app(if(),x9) -> if1(x9)
        app(le1(x8),x9) -> le2(x8,x9)
        app(le(),x9) -> le1(x9)
        app(map1(x8),x9) -> map2(x8,x9)
        app(map(),x9) -> map1(x9)
        app(cons1(x8),x9) -> cons2(x8,x9)
        app(cons(),x9) -> cons1(x9)
        app(filter1(x8),x9) -> filter2(x8,x9)
        app(filter(),x9) -> filter1(x9)
        app(filter23(x8,x7,x6),x9) -> filter24(x8,x7,x6,x9)
        app(filter22(x8,x7),x9) -> filter23(x8,x7,x9)
        app(filter21(x8),x9) -> filter22(x8,x9)
        app(filter2(),x9) -> filter21(x9)
       graph:
        
       Qed