old_contents: """@author: Bryan Silverthorn <bcs@cargo-cult.org>"""
  
  import contextlib
  import borg
  
  from . import features
  from . import instance
  from . import solvers
  
  class SatisfiabilityTask(object):
      def __init__(self, path):
          self.path = path
  
      def clean(self):
          pass
  
  @borg.named_domain
  class Satisfiability(object):
      name = "sat"
      extensions = ["*.cnf"]
  
      @contextlib.contextmanager
      def task_from_path(self, task_path):
          """Clean up cached task resources on context exit."""
  
          task = SatisfiabilityTask(task_path)
  
          yield task
  
          task.clean()
  
      def compute_features(self, task):
          return features.get_features_for(task.path)
  
      def is_final(self, task, answer):
          """Is the answer definitive for the task?"""
  
          return answer is not None
  
      def write_answer(self, file_, answer):
          pass
  
      def read_answer(self, file_):
          pass
  
      def show_answer(self, task, answer):
          if answer is None:
              print "s UNKNOWN"
  
              return 0
          elif answer:
              print "s SATISFIABLE"
              print "v", " ".join(map(str, answer)), "0"
  
              return 10
          else:
              print "s UNSATISFIABLE"
  
              return 20
  
  
new_contents: """@author: Bryan Silverthorn <bcs@cargo-cult.org>"""
  
  import contextlib
  import borg
  
  from . import features
  from . import instance
  from . import solvers
  
  class SatisfiabilityTask(object):
      def __init__(self, path):
          self.path = path
  
      def clean(self):
          pass
  
  @borg.named_domain
  class Satisfiability(object):
      name = "sat"
      extensions = ["*.cnf"]
  
      @contextlib.contextmanager
      def task_from_path(self, task_path):
          """Clean up cached task resources on context exit."""
  
          task = SatisfiabilityTask(task_path)
  
          yield task
  
          task.clean()
  
      def compute_features(self, task):
          return features.get_features_for(task.path)
  
      def is_final(self, task, answer):
          """Is the answer definitive for the task?"""
  
          return answer is not None
  
      def show_answer(self, task, answer):
          if answer is None:
              print "s UNKNOWN"
  
              return 0
          elif answer:
              print "s SATISFIABLE"
              print "v", " ".join(map(str, answer)), "0"
  
              return 10
          else:
              print "s UNSATISFIABLE"
  
              return 20
  
  
subject: Remove unimplemented methods.