WORST_CASE(?,O(n^2))
* Step 1: Ara WORST_CASE(?,O(n^2))
    + Considered Problem:
        - Strict TRS:
            a__tail(X) -> tail(X)
            a__tail(cons(X,XS)) -> mark(XS)
            a__zeros() -> cons(0(),zeros())
            a__zeros() -> zeros()
            mark(0()) -> 0()
            mark(cons(X1,X2)) -> cons(mark(X1),X2)
            mark(tail(X)) -> a__tail(mark(X))
            mark(zeros()) -> a__zeros()
        - Signature:
            {a__tail/1,a__zeros/0,mark/1} / {0/0,cons/2,tail/1,zeros/0}
        - Obligation:
            innermost runtime complexity wrt. defined symbols {a__tail,a__zeros,mark} and constructors {0,cons,tail
            ,zeros}
    + Applied Processor:
        Ara {heuristics_ = NoHeuristics, minDegree = 1, maxDegree = 3, araTimeout = 60, araFindStrictRules = Nothing, araSmtSolver = Z3}
    + Details:
        Signatures used:
        ----------------
          0 :: [] -(0)-> A(14, 0)
          0 :: [] -(0)-> A(7, 12)
          0 :: [] -(0)-> A(4, 14)
          a__tail :: [A(2, 12)] -(7)-> A(2, 12)
          a__zeros :: [] -(5)-> A(2, 12)
          cons :: [A(2, 0) x A(14, 0)] -(2)-> A(2, 12)
          cons :: [A(14, 0) x A(14, 0)] -(14)-> A(14, 0)
          cons :: [A(3, 0) x A(15, 0)] -(3)-> A(3, 12)
          mark :: [A(14, 0)] -(7)-> A(2, 12)
          tail :: [A(14, 0)] -(14)-> A(14, 0)
          tail :: [A(2, 0)] -(2)-> A(2, 15)
          zeros :: [] -(0)-> A(14, 0)
          zeros :: [] -(0)-> A(15, 12)
          zeros :: [] -(0)-> A(4, 14)
        
        
        Cost-free Signatures used:
        --------------------------
          0 :: [] -(0)-> A_cf(0, 0)
          a__tail :: [A_cf(0, 0)] -(0)-> A_cf(0, 0)
          a__zeros :: [] -(0)-> A_cf(0, 0)
          cons :: [A_cf(0, 0) x A_cf(0, 0)] -(0)-> A_cf(0, 0)
          mark :: [A_cf(0, 0)] -(0)-> A_cf(0, 0)
          tail :: [A_cf(0, 0)] -(0)-> A_cf(0, 0)
          zeros :: [] -(0)-> A_cf(0, 0)
        
        
        Base Constructor Signatures used:
        ---------------------------------
          0_A :: [] -(0)-> A(1, 0)
          0_A :: [] -(0)-> A(0, 1)
          cons_A :: [A(1, 0) x A(1, 0)] -(1)-> A(1, 0)
          cons_A :: [A(0, 0) x A(1, 0)] -(0)-> A(0, 1)
          tail_A :: [A(1, 0)] -(1)-> A(1, 0)
          tail_A :: [A(0, 0)] -(0)-> A(0, 1)
          zeros_A :: [] -(0)-> A(1, 0)
          zeros_A :: [] -(0)-> A(0, 1)
        
* Step 2: Open MAYBE
    - Strict TRS:
        a__tail(X) -> tail(X)
        a__tail(cons(X,XS)) -> mark(XS)
        a__zeros() -> cons(0(),zeros())
        a__zeros() -> zeros()
        mark(0()) -> 0()
        mark(cons(X1,X2)) -> cons(mark(X1),X2)
        mark(tail(X)) -> a__tail(mark(X))
        mark(zeros()) -> a__zeros()
    - Signature:
        {a__tail/1,a__zeros/0,mark/1} / {0/0,cons/2,tail/1,zeros/0}
    - Obligation:
        innermost runtime complexity wrt. defined symbols {a__tail,a__zeros,mark} and constructors {0,cons,tail
        ,zeros}
Following problems could not be solved:
  - Strict TRS:
      a__tail(X) -> tail(X)
      a__tail(cons(X,XS)) -> mark(XS)
      a__zeros() -> cons(0(),zeros())
      a__zeros() -> zeros()
      mark(0()) -> 0()
      mark(cons(X1,X2)) -> cons(mark(X1),X2)
      mark(tail(X)) -> a__tail(mark(X))
      mark(zeros()) -> a__zeros()
  - Signature:
      {a__tail/1,a__zeros/0,mark/1} / {0/0,cons/2,tail/1,zeros/0}
  - Obligation:
      innermost runtime complexity wrt. defined symbols {a__tail,a__zeros,mark} and constructors {0,cons,tail
      ,zeros}
WORST_CASE(?,O(n^2))