* Step 1: Sum WORST_CASE(Omega(n^1),O(n^1))
    + Considered Problem:
        - Strict TRS:
            dbl(0(),y) -> y
            dbl(S(0()),S(0())) -> S(S(S(S(0()))))
            unsafe(0()) -> 0()
            unsafe(S(x)) -> dbl(unsafe(x),0())
        - Signature:
            {dbl/2,unsafe/1} / {0/0,S/1}
        - Obligation:
            innermost runtime complexity wrt. defined symbols {dbl,unsafe} and constructors {0,S}
    + Applied Processor:
        Sum {left = someStrategy, right = someStrategy}
    + Details:
        ()
** Step 1.a:1: DecreasingLoops WORST_CASE(Omega(n^1),?)
    + Considered Problem:
        - Strict TRS:
            dbl(0(),y) -> y
            dbl(S(0()),S(0())) -> S(S(S(S(0()))))
            unsafe(0()) -> 0()
            unsafe(S(x)) -> dbl(unsafe(x),0())
        - Signature:
            {dbl/2,unsafe/1} / {0/0,S/1}
        - Obligation:
            innermost runtime complexity wrt. defined symbols {dbl,unsafe} and constructors {0,S}
    + Applied Processor:
        DecreasingLoops {bound = AnyLoop, narrow = 10}
    + Details:
        The system has following decreasing Loops:
          unsafe(x){x -> S(x)} =
            unsafe(S(x)) ->^+ dbl(unsafe(x),0())
              = C[unsafe(x) = unsafe(x){}]

** Step 1.b:1: Bounds WORST_CASE(?,O(n^1))
    + Considered Problem:
        - Strict TRS:
            dbl(0(),y) -> y
            dbl(S(0()),S(0())) -> S(S(S(S(0()))))
            unsafe(0()) -> 0()
            unsafe(S(x)) -> dbl(unsafe(x),0())
        - Signature:
            {dbl/2,unsafe/1} / {0/0,S/1}
        - Obligation:
            innermost runtime complexity wrt. defined symbols {dbl,unsafe} and constructors {0,S}
    + Applied Processor:
        Bounds {initialAutomaton = minimal, enrichment = match}
    + Details:
        The problem is match-bounded by 1.
        The enriched problem is compatible with follwoing automaton.
          0_0() -> 1
          0_0() -> 2
          0_1() -> 1
          0_1() -> 6
          0_1() -> 7
          S_0(2) -> 1
          S_0(2) -> 2
          S_1(3) -> 1
          S_1(4) -> 3
          S_1(5) -> 4
          S_1(6) -> 5
          dbl_0(2,2) -> 1
          dbl_1(7,6) -> 1
          dbl_1(7,7) -> 7
          unsafe_0(2) -> 1
          unsafe_1(2) -> 7
          2 -> 1
          6 -> 1
** Step 1.b:2: EmptyProcessor WORST_CASE(?,O(1))
    + Considered Problem:
        - Weak TRS:
            dbl(0(),y) -> y
            dbl(S(0()),S(0())) -> S(S(S(S(0()))))
            unsafe(0()) -> 0()
            unsafe(S(x)) -> dbl(unsafe(x),0())
        - Signature:
            {dbl/2,unsafe/1} / {0/0,S/1}
        - Obligation:
            innermost runtime complexity wrt. defined symbols {dbl,unsafe} and constructors {0,S}
    + Applied Processor:
        EmptyProcessor
    + Details:
        The problem is already closed. The intended complexity is O(1).

WORST_CASE(Omega(n^1),O(n^1))