* Step 1: Sum WORST_CASE(Omega(n^1),?)
    + Considered Problem:
        - Strict TRS:
            0() -> n__0()
            U11(tt(),L) -> s(length(activate(L)))
            activate(X) -> X
            activate(n__0()) -> 0()
            activate(n__cons(X1,X2)) -> cons(activate(X1),X2)
            activate(n__isNat(X)) -> isNat(X)
            activate(n__isNatIList(X)) -> isNatIList(X)
            activate(n__isNatList(X)) -> isNatList(X)
            activate(n__length(X)) -> length(activate(X))
            activate(n__nil()) -> nil()
            activate(n__s(X)) -> s(activate(X))
            activate(n__zeros()) -> zeros()
            and(tt(),X) -> activate(X)
            cons(X1,X2) -> n__cons(X1,X2)
            isNat(X) -> n__isNat(X)
            isNat(n__0()) -> tt()
            isNat(n__length(V1)) -> isNatList(activate(V1))
            isNat(n__s(V1)) -> isNat(activate(V1))
            isNatIList(V) -> isNatList(activate(V))
            isNatIList(X) -> n__isNatIList(X)
            isNatIList(n__cons(V1,V2)) -> and(isNat(activate(V1)),n__isNatIList(activate(V2)))
            isNatIList(n__zeros()) -> tt()
            isNatList(X) -> n__isNatList(X)
            isNatList(n__cons(V1,V2)) -> and(isNat(activate(V1)),n__isNatList(activate(V2)))
            isNatList(n__nil()) -> tt()
            length(X) -> n__length(X)
            length(cons(N,L)) -> U11(and(isNatList(activate(L)),n__isNat(N)),activate(L))
            length(nil()) -> 0()
            nil() -> n__nil()
            s(X) -> n__s(X)
            zeros() -> cons(0(),n__zeros())
            zeros() -> n__zeros()
        - Signature:
            {0/0,U11/2,activate/1,and/2,cons/2,isNat/1,isNatIList/1,isNatList/1,length/1,nil/0,s/1,zeros/0} / {n__0/0
            ,n__cons/2,n__isNat/1,n__isNatIList/1,n__isNatList/1,n__length/1,n__nil/0,n__s/1,n__zeros/0,tt/0}
        - Obligation:
            innermost runtime complexity wrt. defined symbols {0,U11,activate,and,cons,isNat,isNatIList,isNatList,length
            ,nil,s,zeros} and constructors {n__0,n__cons,n__isNat,n__isNatIList,n__isNatList,n__length,n__nil,n__s
            ,n__zeros,tt}
    + Applied Processor:
        Sum {left = someStrategy, right = someStrategy}
    + Details:
        ()
* Step 2: DecreasingLoops WORST_CASE(Omega(n^1),?)
    + Considered Problem:
        - Strict TRS:
            0() -> n__0()
            U11(tt(),L) -> s(length(activate(L)))
            activate(X) -> X
            activate(n__0()) -> 0()
            activate(n__cons(X1,X2)) -> cons(activate(X1),X2)
            activate(n__isNat(X)) -> isNat(X)
            activate(n__isNatIList(X)) -> isNatIList(X)
            activate(n__isNatList(X)) -> isNatList(X)
            activate(n__length(X)) -> length(activate(X))
            activate(n__nil()) -> nil()
            activate(n__s(X)) -> s(activate(X))
            activate(n__zeros()) -> zeros()
            and(tt(),X) -> activate(X)
            cons(X1,X2) -> n__cons(X1,X2)
            isNat(X) -> n__isNat(X)
            isNat(n__0()) -> tt()
            isNat(n__length(V1)) -> isNatList(activate(V1))
            isNat(n__s(V1)) -> isNat(activate(V1))
            isNatIList(V) -> isNatList(activate(V))
            isNatIList(X) -> n__isNatIList(X)
            isNatIList(n__cons(V1,V2)) -> and(isNat(activate(V1)),n__isNatIList(activate(V2)))
            isNatIList(n__zeros()) -> tt()
            isNatList(X) -> n__isNatList(X)
            isNatList(n__cons(V1,V2)) -> and(isNat(activate(V1)),n__isNatList(activate(V2)))
            isNatList(n__nil()) -> tt()
            length(X) -> n__length(X)
            length(cons(N,L)) -> U11(and(isNatList(activate(L)),n__isNat(N)),activate(L))
            length(nil()) -> 0()
            nil() -> n__nil()
            s(X) -> n__s(X)
            zeros() -> cons(0(),n__zeros())
            zeros() -> n__zeros()
        - Signature:
            {0/0,U11/2,activate/1,and/2,cons/2,isNat/1,isNatIList/1,isNatList/1,length/1,nil/0,s/1,zeros/0} / {n__0/0
            ,n__cons/2,n__isNat/1,n__isNatIList/1,n__isNatList/1,n__length/1,n__nil/0,n__s/1,n__zeros/0,tt/0}
        - Obligation:
            innermost runtime complexity wrt. defined symbols {0,U11,activate,and,cons,isNat,isNatIList,isNatList,length
            ,nil,s,zeros} and constructors {n__0,n__cons,n__isNat,n__isNatIList,n__isNatList,n__length,n__nil,n__s
            ,n__zeros,tt}
    + Applied Processor:
        DecreasingLoops {bound = AnyLoop, narrow = 10}
    + Details:
        The system has following decreasing Loops:
          activate(x){x -> n__cons(x,y)} =
            activate(n__cons(x,y)) ->^+ cons(activate(x),y)
              = C[activate(x) = activate(x){}]

WORST_CASE(Omega(n^1),?)