returns the experiments as a``TermSet`` object [instance].

def get_best_single_experiments(nets,expvars):
  '''
  returns the experiments as a``TermSet`` object [instance].
  '''
  netsf    = nets.to_file()
  expvarsf = expvars.to_file()

  i = 1 #single experiment

  num_exp   = String2TermSet('pexperiment('+str(i)+')')
  num_expf  = num_exp.to_file()
  prg       = [ netsf, expvarsf, num_expf, find_best_exp_sets_prg ,
                elem_path_prg ]
  coptions  = '--project --opt-mode=optN --opt-strategy=0 --opt-heuristic'
  solver    = GringoClasp(clasp_options=coptions)
  solutions = solver.run(prg,collapseTerms=True,collapseAtoms=False)

  os.unlink(num_expf)

  os.unlink(netsf)
  os.unlink(expvarsf)
  return solutions