YES

Problem:
 app(app(times(),x),0()) -> 0()
 app(app(times(),x),app(s(),y)) -> app(app(plus(),app(app(times(),x),y)),x)
 app(app(plus(),x),0()) -> x
 app(app(plus(),0()),x) -> x
 app(app(plus(),x),app(s(),y)) -> app(s(),app(app(plus(),x),y))
 app(app(plus(),app(s(),x)),y) -> app(s(),app(app(plus(),x),y))
 app(app(map(),f),nil()) -> nil()
 app(app(map(),f),app(app(cons(),x),xs)) -> app(app(cons(),app(f,x)),app(app(map(),f),xs))
 app(app(filter(),f),nil()) -> nil()
 app(app(filter(),f),app(app(cons(),x),xs)) -> app(app(app(app(filter2(),app(f,x)),f),x),xs)
 app(app(app(app(filter2(),true()),f),x),xs) -> app(app(cons(),x),app(app(filter(),f),xs))
 app(app(app(app(filter2(),false()),f),x),xs) -> app(app(filter(),f),xs)

Proof:
 Uncurry Processor:
  times2(x,0()) -> 0()
  times2(x,s1(y)) -> plus2(times2(x,y),x)
  plus2(x,0()) -> x
  plus2(0(),x) -> x
  plus2(x,s1(y)) -> s1(plus2(x,y))
  plus2(s1(x),y) -> s1(plus2(x,y))
  map2(f,nil()) -> nil()
  map2(f,cons2(x,xs)) -> cons2(app(f,x),map2(f,xs))
  filter2(f,nil()) -> nil()
  filter2(f,cons2(x,xs)) -> filter24(app(f,x),f,x,xs)
  filter24(true(),f,x,xs) -> cons2(x,filter2(f,xs))
  filter24(false(),f,x,xs) -> filter2(f,xs)
  app(times1(x6),x7) -> times2(x6,x7)
  app(times(),x7) -> times1(x7)
  app(s(),x7) -> s1(x7)
  app(plus1(x6),x7) -> plus2(x6,x7)
  app(plus(),x7) -> plus1(x7)
  app(map1(x6),x7) -> map2(x6,x7)
  app(map(),x7) -> map1(x7)
  app(cons1(x6),x7) -> cons2(x6,x7)
  app(cons(),x7) -> cons1(x7)
  app(filter1(x6),x7) -> filter2(x6,x7)
  app(filter(),x7) -> filter1(x7)
  app(filter23(x6,x5,x4),x7) -> filter24(x6,x5,x4,x7)
  app(filter22(x6,x5),x7) -> filter23(x6,x5,x7)
  app(filter21(x6),x7) -> filter22(x6,x7)
  app(filter2(),x7) -> filter21(x7)
  DP Processor:
   DPs:
    times{2,#}(x,s1(y)) -> times{2,#}(x,y)
    times{2,#}(x,s1(y)) -> plus{2,#}(times2(x,y),x)
    plus{2,#}(x,s1(y)) -> plus{2,#}(x,y)
    plus{2,#}(s1(x),y) -> plus{2,#}(x,y)
    map{2,#}(f,cons2(x,xs)) -> map{2,#}(f,xs)
    map{2,#}(f,cons2(x,xs)) -> app#(f,x)
    filter{2,#}(f,cons2(x,xs)) -> app#(f,x)
    filter{2,#}(f,cons2(x,xs)) -> filter2{4,#}(app(f,x),f,x,xs)
    filter2{4,#}(true(),f,x,xs) -> filter{2,#}(f,xs)
    filter2{4,#}(false(),f,x,xs) -> filter{2,#}(f,xs)
    app#(times1(x6),x7) -> times{2,#}(x6,x7)
    app#(plus1(x6),x7) -> plus{2,#}(x6,x7)
    app#(map1(x6),x7) -> map{2,#}(x6,x7)
    app#(filter1(x6),x7) -> filter{2,#}(x6,x7)
    app#(filter23(x6,x5,x4),x7) -> filter2{4,#}(x6,x5,x4,x7)
   TRS:
    times2(x,0()) -> 0()
    times2(x,s1(y)) -> plus2(times2(x,y),x)
    plus2(x,0()) -> x
    plus2(0(),x) -> x
    plus2(x,s1(y)) -> s1(plus2(x,y))
    plus2(s1(x),y) -> s1(plus2(x,y))
    map2(f,nil()) -> nil()
    map2(f,cons2(x,xs)) -> cons2(app(f,x),map2(f,xs))
    filter2(f,nil()) -> nil()
    filter2(f,cons2(x,xs)) -> filter24(app(f,x),f,x,xs)
    filter24(true(),f,x,xs) -> cons2(x,filter2(f,xs))
    filter24(false(),f,x,xs) -> filter2(f,xs)
    app(times1(x6),x7) -> times2(x6,x7)
    app(times(),x7) -> times1(x7)
    app(s(),x7) -> s1(x7)
    app(plus1(x6),x7) -> plus2(x6,x7)
    app(plus(),x7) -> plus1(x7)
    app(map1(x6),x7) -> map2(x6,x7)
    app(map(),x7) -> map1(x7)
    app(cons1(x6),x7) -> cons2(x6,x7)
    app(cons(),x7) -> cons1(x7)
    app(filter1(x6),x7) -> filter2(x6,x7)
    app(filter(),x7) -> filter1(x7)
    app(filter23(x6,x5,x4),x7) -> filter24(x6,x5,x4,x7)
    app(filter22(x6,x5),x7) -> filter23(x6,x5,x7)
    app(filter21(x6),x7) -> filter22(x6,x7)
    app(filter2(),x7) -> filter21(x7)
   TDG Processor:
    DPs:
     times{2,#}(x,s1(y)) -> times{2,#}(x,y)
     times{2,#}(x,s1(y)) -> plus{2,#}(times2(x,y),x)
     plus{2,#}(x,s1(y)) -> plus{2,#}(x,y)
     plus{2,#}(s1(x),y) -> plus{2,#}(x,y)
     map{2,#}(f,cons2(x,xs)) -> map{2,#}(f,xs)
     map{2,#}(f,cons2(x,xs)) -> app#(f,x)
     filter{2,#}(f,cons2(x,xs)) -> app#(f,x)
     filter{2,#}(f,cons2(x,xs)) -> filter2{4,#}(app(f,x),f,x,xs)
     filter2{4,#}(true(),f,x,xs) -> filter{2,#}(f,xs)
     filter2{4,#}(false(),f,x,xs) -> filter{2,#}(f,xs)
     app#(times1(x6),x7) -> times{2,#}(x6,x7)
     app#(plus1(x6),x7) -> plus{2,#}(x6,x7)
     app#(map1(x6),x7) -> map{2,#}(x6,x7)
     app#(filter1(x6),x7) -> filter{2,#}(x6,x7)
     app#(filter23(x6,x5,x4),x7) -> filter2{4,#}(x6,x5,x4,x7)
    TRS:
     times2(x,0()) -> 0()
     times2(x,s1(y)) -> plus2(times2(x,y),x)
     plus2(x,0()) -> x
     plus2(0(),x) -> x
     plus2(x,s1(y)) -> s1(plus2(x,y))
     plus2(s1(x),y) -> s1(plus2(x,y))
     map2(f,nil()) -> nil()
     map2(f,cons2(x,xs)) -> cons2(app(f,x),map2(f,xs))
     filter2(f,nil()) -> nil()
     filter2(f,cons2(x,xs)) -> filter24(app(f,x),f,x,xs)
     filter24(true(),f,x,xs) -> cons2(x,filter2(f,xs))
     filter24(false(),f,x,xs) -> filter2(f,xs)
     app(times1(x6),x7) -> times2(x6,x7)
     app(times(),x7) -> times1(x7)
     app(s(),x7) -> s1(x7)
     app(plus1(x6),x7) -> plus2(x6,x7)
     app(plus(),x7) -> plus1(x7)
     app(map1(x6),x7) -> map2(x6,x7)
     app(map(),x7) -> map1(x7)
     app(cons1(x6),x7) -> cons2(x6,x7)
     app(cons(),x7) -> cons1(x7)
     app(filter1(x6),x7) -> filter2(x6,x7)
     app(filter(),x7) -> filter1(x7)
     app(filter23(x6,x5,x4),x7) -> filter24(x6,x5,x4,x7)
     app(filter22(x6,x5),x7) -> filter23(x6,x5,x7)
     app(filter21(x6),x7) -> filter22(x6,x7)
     app(filter2(),x7) -> filter21(x7)
    graph:
     filter2{4,#}(false(),f,x,xs) -> filter{2,#}(f,xs) ->
     filter{2,#}(f,cons2(x,xs)) -> filter2{4,#}(app(f,x),f,x,xs)
     filter2{4,#}(false(),f,x,xs) -> filter{2,#}(f,xs) ->
     filter{2,#}(f,cons2(x,xs)) -> app#(f,x)
     filter2{4,#}(true(),f,x,xs) -> filter{2,#}(f,xs) ->
     filter{2,#}(f,cons2(x,xs)) -> filter2{4,#}(app(f,x),f,x,xs)
     filter2{4,#}(true(),f,x,xs) -> filter{2,#}(f,xs) ->
     filter{2,#}(f,cons2(x,xs)) -> app#(f,x)
     filter{2,#}(f,cons2(x,xs)) -> filter2{4,#}(app(f,x),f,x,xs) ->
     filter2{4,#}(false(),f,x,xs) -> filter{2,#}(f,xs)
     filter{2,#}(f,cons2(x,xs)) -> filter2{4,#}(app(f,x),f,x,xs) ->
     filter2{4,#}(true(),f,x,xs) -> filter{2,#}(f,xs)
     filter{2,#}(f,cons2(x,xs)) -> app#(f,x) ->
     app#(filter23(x6,x5,x4),x7) -> filter2{4,#}(x6,x5,x4,x7)
     filter{2,#}(f,cons2(x,xs)) -> app#(f,x) ->
     app#(filter1(x6),x7) -> filter{2,#}(x6,x7)
     filter{2,#}(f,cons2(x,xs)) -> app#(f,x) ->
     app#(map1(x6),x7) -> map{2,#}(x6,x7)
     filter{2,#}(f,cons2(x,xs)) -> app#(f,x) ->
     app#(plus1(x6),x7) -> plus{2,#}(x6,x7)
     filter{2,#}(f,cons2(x,xs)) -> app#(f,x) ->
     app#(times1(x6),x7) -> times{2,#}(x6,x7)
     app#(filter23(x6,x5,x4),x7) -> filter2{4,#}(x6,x5,x4,x7) ->
     filter2{4,#}(false(),f,x,xs) -> filter{2,#}(f,xs)
     app#(filter23(x6,x5,x4),x7) -> filter2{4,#}(x6,x5,x4,x7) ->
     filter2{4,#}(true(),f,x,xs) -> filter{2,#}(f,xs)
     app#(filter1(x6),x7) -> filter{2,#}(x6,x7) ->
     filter{2,#}(f,cons2(x,xs)) -> filter2{4,#}(app(f,x),f,x,xs)
     app#(filter1(x6),x7) -> filter{2,#}(x6,x7) ->
     filter{2,#}(f,cons2(x,xs)) -> app#(f,x)
     app#(map1(x6),x7) -> map{2,#}(x6,x7) ->
     map{2,#}(f,cons2(x,xs)) -> app#(f,x)
     app#(map1(x6),x7) -> map{2,#}(x6,x7) ->
     map{2,#}(f,cons2(x,xs)) -> map{2,#}(f,xs)
     app#(plus1(x6),x7) -> plus{2,#}(x6,x7) ->
     plus{2,#}(s1(x),y) -> plus{2,#}(x,y)
     app#(plus1(x6),x7) -> plus{2,#}(x6,x7) ->
     plus{2,#}(x,s1(y)) -> plus{2,#}(x,y)
     app#(times1(x6),x7) -> times{2,#}(x6,x7) ->
     times{2,#}(x,s1(y)) -> plus{2,#}(times2(x,y),x)
     app#(times1(x6),x7) -> times{2,#}(x6,x7) ->
     times{2,#}(x,s1(y)) -> times{2,#}(x,y)
     map{2,#}(f,cons2(x,xs)) -> app#(f,x) ->
     app#(filter23(x6,x5,x4),x7) -> filter2{4,#}(x6,x5,x4,x7)
     map{2,#}(f,cons2(x,xs)) -> app#(f,x) ->
     app#(filter1(x6),x7) -> filter{2,#}(x6,x7)
     map{2,#}(f,cons2(x,xs)) -> app#(f,x) ->
     app#(map1(x6),x7) -> map{2,#}(x6,x7)
     map{2,#}(f,cons2(x,xs)) -> app#(f,x) ->
     app#(plus1(x6),x7) -> plus{2,#}(x6,x7)
     map{2,#}(f,cons2(x,xs)) -> app#(f,x) ->
     app#(times1(x6),x7) -> times{2,#}(x6,x7)
     map{2,#}(f,cons2(x,xs)) -> map{2,#}(f,xs) ->
     map{2,#}(f,cons2(x,xs)) -> app#(f,x)
     map{2,#}(f,cons2(x,xs)) -> map{2,#}(f,xs) ->
     map{2,#}(f,cons2(x,xs)) -> map{2,#}(f,xs)
     plus{2,#}(s1(x),y) -> plus{2,#}(x,y) ->
     plus{2,#}(s1(x),y) -> plus{2,#}(x,y)
     plus{2,#}(s1(x),y) -> plus{2,#}(x,y) ->
     plus{2,#}(x,s1(y)) -> plus{2,#}(x,y)
     plus{2,#}(x,s1(y)) -> plus{2,#}(x,y) ->
     plus{2,#}(s1(x),y) -> plus{2,#}(x,y)
     plus{2,#}(x,s1(y)) -> plus{2,#}(x,y) ->
     plus{2,#}(x,s1(y)) -> plus{2,#}(x,y)
     times{2,#}(x,s1(y)) -> plus{2,#}(times2(x,y),x) ->
     plus{2,#}(s1(x),y) -> plus{2,#}(x,y)
     times{2,#}(x,s1(y)) -> plus{2,#}(times2(x,y),x) ->
     plus{2,#}(x,s1(y)) -> plus{2,#}(x,y)
     times{2,#}(x,s1(y)) -> times{2,#}(x,y) ->
     times{2,#}(x,s1(y)) -> plus{2,#}(times2(x,y),x)
     times{2,#}(x,s1(y)) -> times{2,#}(x,y) -> times{2,#}(x,s1(y)) -> times{2,#}(x,y)
    SCC Processor:
     #sccs: 3
     #rules: 12
     #arcs: 36/225
     DPs:
      filter2{4,#}(false(),f,x,xs) -> filter{2,#}(f,xs)
      filter{2,#}(f,cons2(x,xs)) -> app#(f,x)
      app#(map1(x6),x7) -> map{2,#}(x6,x7)
      map{2,#}(f,cons2(x,xs)) -> map{2,#}(f,xs)
      map{2,#}(f,cons2(x,xs)) -> app#(f,x)
      app#(filter1(x6),x7) -> filter{2,#}(x6,x7)
      filter{2,#}(f,cons2(x,xs)) -> filter2{4,#}(app(f,x),f,x,xs)
      filter2{4,#}(true(),f,x,xs) -> filter{2,#}(f,xs)
      app#(filter23(x6,x5,x4),x7) -> filter2{4,#}(x6,x5,x4,x7)
     TRS:
      times2(x,0()) -> 0()
      times2(x,s1(y)) -> plus2(times2(x,y),x)
      plus2(x,0()) -> x
      plus2(0(),x) -> x
      plus2(x,s1(y)) -> s1(plus2(x,y))
      plus2(s1(x),y) -> s1(plus2(x,y))
      map2(f,nil()) -> nil()
      map2(f,cons2(x,xs)) -> cons2(app(f,x),map2(f,xs))
      filter2(f,nil()) -> nil()
      filter2(f,cons2(x,xs)) -> filter24(app(f,x),f,x,xs)
      filter24(true(),f,x,xs) -> cons2(x,filter2(f,xs))
      filter24(false(),f,x,xs) -> filter2(f,xs)
      app(times1(x6),x7) -> times2(x6,x7)
      app(times(),x7) -> times1(x7)
      app(s(),x7) -> s1(x7)
      app(plus1(x6),x7) -> plus2(x6,x7)
      app(plus(),x7) -> plus1(x7)
      app(map1(x6),x7) -> map2(x6,x7)
      app(map(),x7) -> map1(x7)
      app(cons1(x6),x7) -> cons2(x6,x7)
      app(cons(),x7) -> cons1(x7)
      app(filter1(x6),x7) -> filter2(x6,x7)
      app(filter(),x7) -> filter1(x7)
      app(filter23(x6,x5,x4),x7) -> filter24(x6,x5,x4,x7)
      app(filter22(x6,x5),x7) -> filter23(x6,x5,x7)
      app(filter21(x6),x7) -> filter22(x6,x7)
      app(filter2(),x7) -> filter21(x7)
     Subterm Criterion Processor:
      simple projection:
       pi(map{2,#}) = 1
       pi(app#) = 1
       pi(filter{2,#}) = 1
       pi(filter2{4,#}) = 3
      problem:
       DPs:
        filter2{4,#}(false(),f,x,xs) -> filter{2,#}(f,xs)
        app#(map1(x6),x7) -> map{2,#}(x6,x7)
        app#(filter1(x6),x7) -> filter{2,#}(x6,x7)
        filter2{4,#}(true(),f,x,xs) -> filter{2,#}(f,xs)
        app#(filter23(x6,x5,x4),x7) -> filter2{4,#}(x6,x5,x4,x7)
       TRS:
        times2(x,0()) -> 0()
        times2(x,s1(y)) -> plus2(times2(x,y),x)
        plus2(x,0()) -> x
        plus2(0(),x) -> x
        plus2(x,s1(y)) -> s1(plus2(x,y))
        plus2(s1(x),y) -> s1(plus2(x,y))
        map2(f,nil()) -> nil()
        map2(f,cons2(x,xs)) -> cons2(app(f,x),map2(f,xs))
        filter2(f,nil()) -> nil()
        filter2(f,cons2(x,xs)) -> filter24(app(f,x),f,x,xs)
        filter24(true(),f,x,xs) -> cons2(x,filter2(f,xs))
        filter24(false(),f,x,xs) -> filter2(f,xs)
        app(times1(x6),x7) -> times2(x6,x7)
        app(times(),x7) -> times1(x7)
        app(s(),x7) -> s1(x7)
        app(plus1(x6),x7) -> plus2(x6,x7)
        app(plus(),x7) -> plus1(x7)
        app(map1(x6),x7) -> map2(x6,x7)
        app(map(),x7) -> map1(x7)
        app(cons1(x6),x7) -> cons2(x6,x7)
        app(cons(),x7) -> cons1(x7)
        app(filter1(x6),x7) -> filter2(x6,x7)
        app(filter(),x7) -> filter1(x7)
        app(filter23(x6,x5,x4),x7) -> filter24(x6,x5,x4,x7)
        app(filter22(x6,x5),x7) -> filter23(x6,x5,x7)
        app(filter21(x6),x7) -> filter22(x6,x7)
        app(filter2(),x7) -> filter21(x7)
      SCC Processor:
       #sccs: 0
       #rules: 0
       #arcs: 20/25
       
     
     DPs:
      times{2,#}(x,s1(y)) -> times{2,#}(x,y)
     TRS:
      times2(x,0()) -> 0()
      times2(x,s1(y)) -> plus2(times2(x,y),x)
      plus2(x,0()) -> x
      plus2(0(),x) -> x
      plus2(x,s1(y)) -> s1(plus2(x,y))
      plus2(s1(x),y) -> s1(plus2(x,y))
      map2(f,nil()) -> nil()
      map2(f,cons2(x,xs)) -> cons2(app(f,x),map2(f,xs))
      filter2(f,nil()) -> nil()
      filter2(f,cons2(x,xs)) -> filter24(app(f,x),f,x,xs)
      filter24(true(),f,x,xs) -> cons2(x,filter2(f,xs))
      filter24(false(),f,x,xs) -> filter2(f,xs)
      app(times1(x6),x7) -> times2(x6,x7)
      app(times(),x7) -> times1(x7)
      app(s(),x7) -> s1(x7)
      app(plus1(x6),x7) -> plus2(x6,x7)
      app(plus(),x7) -> plus1(x7)
      app(map1(x6),x7) -> map2(x6,x7)
      app(map(),x7) -> map1(x7)
      app(cons1(x6),x7) -> cons2(x6,x7)
      app(cons(),x7) -> cons1(x7)
      app(filter1(x6),x7) -> filter2(x6,x7)
      app(filter(),x7) -> filter1(x7)
      app(filter23(x6,x5,x4),x7) -> filter24(x6,x5,x4,x7)
      app(filter22(x6,x5),x7) -> filter23(x6,x5,x7)
      app(filter21(x6),x7) -> filter22(x6,x7)
      app(filter2(),x7) -> filter21(x7)
     Subterm Criterion Processor:
      simple projection:
       pi(times{2,#}) = 1
      problem:
       DPs:
        
       TRS:
        times2(x,0()) -> 0()
        times2(x,s1(y)) -> plus2(times2(x,y),x)
        plus2(x,0()) -> x
        plus2(0(),x) -> x
        plus2(x,s1(y)) -> s1(plus2(x,y))
        plus2(s1(x),y) -> s1(plus2(x,y))
        map2(f,nil()) -> nil()
        map2(f,cons2(x,xs)) -> cons2(app(f,x),map2(f,xs))
        filter2(f,nil()) -> nil()
        filter2(f,cons2(x,xs)) -> filter24(app(f,x),f,x,xs)
        filter24(true(),f,x,xs) -> cons2(x,filter2(f,xs))
        filter24(false(),f,x,xs) -> filter2(f,xs)
        app(times1(x6),x7) -> times2(x6,x7)
        app(times(),x7) -> times1(x7)
        app(s(),x7) -> s1(x7)
        app(plus1(x6),x7) -> plus2(x6,x7)
        app(plus(),x7) -> plus1(x7)
        app(map1(x6),x7) -> map2(x6,x7)
        app(map(),x7) -> map1(x7)
        app(cons1(x6),x7) -> cons2(x6,x7)
        app(cons(),x7) -> cons1(x7)
        app(filter1(x6),x7) -> filter2(x6,x7)
        app(filter(),x7) -> filter1(x7)
        app(filter23(x6,x5,x4),x7) -> filter24(x6,x5,x4,x7)
        app(filter22(x6,x5),x7) -> filter23(x6,x5,x7)
        app(filter21(x6),x7) -> filter22(x6,x7)
        app(filter2(),x7) -> filter21(x7)
      Qed
     
     DPs:
      plus{2,#}(x,s1(y)) -> plus{2,#}(x,y)
      plus{2,#}(s1(x),y) -> plus{2,#}(x,y)
     TRS:
      times2(x,0()) -> 0()
      times2(x,s1(y)) -> plus2(times2(x,y),x)
      plus2(x,0()) -> x
      plus2(0(),x) -> x
      plus2(x,s1(y)) -> s1(plus2(x,y))
      plus2(s1(x),y) -> s1(plus2(x,y))
      map2(f,nil()) -> nil()
      map2(f,cons2(x,xs)) -> cons2(app(f,x),map2(f,xs))
      filter2(f,nil()) -> nil()
      filter2(f,cons2(x,xs)) -> filter24(app(f,x),f,x,xs)
      filter24(true(),f,x,xs) -> cons2(x,filter2(f,xs))
      filter24(false(),f,x,xs) -> filter2(f,xs)
      app(times1(x6),x7) -> times2(x6,x7)
      app(times(),x7) -> times1(x7)
      app(s(),x7) -> s1(x7)
      app(plus1(x6),x7) -> plus2(x6,x7)
      app(plus(),x7) -> plus1(x7)
      app(map1(x6),x7) -> map2(x6,x7)
      app(map(),x7) -> map1(x7)
      app(cons1(x6),x7) -> cons2(x6,x7)
      app(cons(),x7) -> cons1(x7)
      app(filter1(x6),x7) -> filter2(x6,x7)
      app(filter(),x7) -> filter1(x7)
      app(filter23(x6,x5,x4),x7) -> filter24(x6,x5,x4,x7)
      app(filter22(x6,x5),x7) -> filter23(x6,x5,x7)
      app(filter21(x6),x7) -> filter22(x6,x7)
      app(filter2(),x7) -> filter21(x7)
     Subterm Criterion Processor:
      simple projection:
       pi(plus{2,#}) = 1
      problem:
       DPs:
        plus{2,#}(s1(x),y) -> plus{2,#}(x,y)
       TRS:
        times2(x,0()) -> 0()
        times2(x,s1(y)) -> plus2(times2(x,y),x)
        plus2(x,0()) -> x
        plus2(0(),x) -> x
        plus2(x,s1(y)) -> s1(plus2(x,y))
        plus2(s1(x),y) -> s1(plus2(x,y))
        map2(f,nil()) -> nil()
        map2(f,cons2(x,xs)) -> cons2(app(f,x),map2(f,xs))
        filter2(f,nil()) -> nil()
        filter2(f,cons2(x,xs)) -> filter24(app(f,x),f,x,xs)
        filter24(true(),f,x,xs) -> cons2(x,filter2(f,xs))
        filter24(false(),f,x,xs) -> filter2(f,xs)
        app(times1(x6),x7) -> times2(x6,x7)
        app(times(),x7) -> times1(x7)
        app(s(),x7) -> s1(x7)
        app(plus1(x6),x7) -> plus2(x6,x7)
        app(plus(),x7) -> plus1(x7)
        app(map1(x6),x7) -> map2(x6,x7)
        app(map(),x7) -> map1(x7)
        app(cons1(x6),x7) -> cons2(x6,x7)
        app(cons(),x7) -> cons1(x7)
        app(filter1(x6),x7) -> filter2(x6,x7)
        app(filter(),x7) -> filter1(x7)
        app(filter23(x6,x5,x4),x7) -> filter24(x6,x5,x4,x7)
        app(filter22(x6,x5),x7) -> filter23(x6,x5,x7)
        app(filter21(x6),x7) -> filter22(x6,x7)
        app(filter2(),x7) -> filter21(x7)
      Subterm Criterion Processor:
       simple projection:
        pi(plus{2,#}) = 0
       problem:
        DPs:
         
        TRS:
         times2(x,0()) -> 0()
         times2(x,s1(y)) -> plus2(times2(x,y),x)
         plus2(x,0()) -> x
         plus2(0(),x) -> x
         plus2(x,s1(y)) -> s1(plus2(x,y))
         plus2(s1(x),y) -> s1(plus2(x,y))
         map2(f,nil()) -> nil()
         map2(f,cons2(x,xs)) -> cons2(app(f,x),map2(f,xs))
         filter2(f,nil()) -> nil()
         filter2(f,cons2(x,xs)) -> filter24(app(f,x),f,x,xs)
         filter24(true(),f,x,xs) -> cons2(x,filter2(f,xs))
         filter24(false(),f,x,xs) -> filter2(f,xs)
         app(times1(x6),x7) -> times2(x6,x7)
         app(times(),x7) -> times1(x7)
         app(s(),x7) -> s1(x7)
         app(plus1(x6),x7) -> plus2(x6,x7)
         app(plus(),x7) -> plus1(x7)
         app(map1(x6),x7) -> map2(x6,x7)
         app(map(),x7) -> map1(x7)
         app(cons1(x6),x7) -> cons2(x6,x7)
         app(cons(),x7) -> cons1(x7)
         app(filter1(x6),x7) -> filter2(x6,x7)
         app(filter(),x7) -> filter1(x7)
         app(filter23(x6,x5,x4),x7) -> filter24(x6,x5,x4,x7)
         app(filter22(x6,x5),x7) -> filter23(x6,x5,x7)
         app(filter21(x6),x7) -> filter22(x6,x7)
         app(filter2(),x7) -> filter21(x7)
       Qed