new_contents: from contextlib import contextmanager
  
  from ktbs_bench.utils.decorators import bench as util_bench
  
  
  class BenchManager:
      def __init__(self):
          self._contexts = []
          self._bench_funcs = []
  
      def bench(self, func):
          """Prepare a function to be benched and add it to the list to be run later."""
          func = util_bench(func)
          self._bench_funcs.append(func)
  
      def context(self, func):
          """Decorate a function to act as a context."""
          func = contextmanager(func)
          self._contexts.append(func)
  
      def run(self, output_file):
          """Execute each collected function against each context."""
          pass
  
subject: Add premise of Bench Manager