code: public <Solution_> void buildProblemBenchmarkList(SolverConfigContext solverConfigContext,
              SolverBenchmarkResult solverBenchmarkResult, Solution_[] extraProblems) {
          PlannerBenchmarkResult plannerBenchmarkResult = solverBenchmarkResult.getPlannerBenchmarkResult();
          List<ProblemBenchmarkResult> unifiedProblemBenchmarkResultList
                  = plannerBenchmarkResult.getUnifiedProblemBenchmarkResultList();
          for (ProblemProvider<Solution_> problemProvider : buildProblemProviderList(
                  solverConfigContext, solverBenchmarkResult, extraProblems)) {
              // 2 SolverBenchmarks containing equal ProblemBenchmarks should contain the same instance
              ProblemBenchmarkResult<Solution_> newProblemBenchmarkResult = buildProblemBenchmark(
                      solverConfigContext, plannerBenchmarkResult, problemProvider);
              ProblemBenchmarkResult problemBenchmarkResult;
              int index = unifiedProblemBenchmarkResultList.indexOf(newProblemBenchmarkResult);
              if (index < 0) {
                  problemBenchmarkResult = newProblemBenchmarkResult;
                  unifiedProblemBenchmarkResultList.add(problemBenchmarkResult);
              } else {
                  problemBenchmarkResult = unifiedProblemBenchmarkResultList.get(index);
              }
              buildSingleBenchmark(solverConfigContext, solverBenchmarkResult, problemBenchmarkResult);
          }
      }
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