/export/starexec/sandbox2/solver/bin/starexec_run_default /export/starexec/sandbox2/benchmark/theBenchmark.xml /export/starexec/sandbox2/output/output_files


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NO

** BEGIN proof argument **
The following rule was generated while unfolding the analyzed TRS:
[iteration = 3] f(f(f(h(_0),_1),_2),_3) -> f(_3,f(f(_2,f(f(_1,f(_0,h(a))),h(a))),h(a)))
Let l be the left-hand side and r be the right-hand side of this rule.
Let p = epsilon, theta1 = {_2->h(_4), _3->f(f(h(_5),_6),h(_7))} and theta2 = {_1->_6, _4->_7, _7->a, _5->_4, _6->f(f(_1,f(_0,h(a))),h(a)), _0->_5}.
We have r|p = f(_3,f(f(_2,f(f(_1,f(_0,h(a))),h(a))),h(a))) and theta2(theta1(l)) = theta1(r|p).
Hence, the term theta1(l) = f(f(f(h(_0),_1),h(_4)),f(f(h(_5),_6),h(_7))) loops w.r.t. the analyzed TRS.
** END proof argument **

** BEGIN proof description **
## Searching for a generalized rewrite rule
(a rule whose right-hand side contains a variable
that does not occur in the left-hand side)...
No generalized rewrite rule found!

## Applying the DP framework...
## 1 initial DP problem to solve.
## First, we try to decompose this problem into smaller problems.
## Round 1 [1 DP problem]:
  ## DP problem:
  Dependency pairs = [f^#(h(_0),_1) -> f^#(_1,f(_0,h(a))), f^#(h(_0),_1) -> f^#(_0,h(a))]
  TRS = {f(h(_0),_1) -> h(f(_1,f(_0,h(a))))}
    ## Trying with homeomorphic embeddings... Failed!
    ## Trying with polynomial interpretations... Failed!
    ## Trying with lexicographic path orders... Failed!
    ## Trying with Knuth-Bendix orders... Failed!
  Don't know whether this DP problem is finite.
## A DP problem could not be proved finite.
## Now, we try to prove that this problem is infinite.
    ## Trying to find a loop (forward=true, backward=true, max=20)
      # max_depth=20, unfold_variables=false:
        # Iteration 0: no loop found, 2 unfolded rules generated.
        # Iteration 1: no loop found, 5 unfolded rules generated.
        # Iteration 2: no loop found, 7 unfolded rules generated.
        # Iteration 3: success, found a loop, 5 unfolded rules generated.
        Here is the successful unfolding. Let IR be the TRS under analysis.
        L0 = f^#(h(_0),_1) -> f^#(_1,f(_0,h(a))) [trans] is in U_IR^0.
        We build a unit triple from L0.
        ==> L1 = f^#(h(_0),_1) -> f^#(_1,f(_0,h(a))) [unit] is in U_IR^1.
        Let p1 = [0].
        We unfold the rule of L1 backwards at position p1
        with the rule f(h(_0),_1) -> h(f(_1,f(_0,h(a)))).
        ==> L2 = f^#(f(h(_0),_1),_2) -> f^#(_2,f(f(_1,f(_0,h(a))),h(a))) [unit] is in U_IR^2.
        Let p2 = [0, 0].
        We unfold the rule of L2 backwards at position p2
        with the rule f(h(_0),_1) -> h(f(_1,f(_0,h(a)))).
        ==> L3 = f^#(f(f(h(_0),_1),_2),_3) -> f^#(_3,f(f(_2,f(f(_1,f(_0,h(a))),h(a))),h(a))) [unit] is in U_IR^3.
  This DP problem is infinite.
Proof run on Linux version 3.10.0-1160.25.1.el7.x86_64 for amd64
using Java version 1.8.0_292
** END proof description **
Total number of generated unfolded rules = 60