Answer: 1
>> chose(ace_inhibitors)	[1]
  *
  |__chose(ace_inhibitors)
  |  |__recommendation(ace_inhibitors)
  |  |  |__reason(ace_inhibitors)
  |  |  |  |__evidence(accf_stage_c)
  |  |  |  |__diagnosis(hf_with_reduced_ef)
  |  |  |  |  |__measurement(lvef,35)

>> chose(diuretics)	[1]
  *
  |__chose(diuretics)
  |  |__recommendation(diuretics)
  |  |  |__reason(diuretics)
  |  |  |  |__evidence(accf_stage_c)
  |  |  |  |__diagnosis(hf_with_reduced_ef)
  |  |  |  |  |__measurement(lvef,35)

>> discarded(beta_blockers)	[1]
  *
  |__discarded(beta_blockers)
  |  |__treatment(beta_blockers)

>> discarded(aldosterone_antagonist)	[1]
  *
  |__discarded(aldosterone_antagonist)
  |  |__treatment(aldosterone_antagonist)

>> discarded(hydralazine)	[1]
  *
  |__discarded(hydralazine)
  |  |__treatment(hydralazine)

>> discarded(isosorbide_dinitrate)	[1]
  *
  |__discarded(isosorbide_dinitrate)
  |  |__treatment(isosorbide_dinitrate)

>> discarded(arbs)	[1]
  *
  |__discarded(arbs)
  |  |__treatment(arbs)

>> discarded(digoxin)	[1]
  *
  |__discarded(digoxin)
  |  |__treatment(digoxin)

>> discarded(anticoagulation)	[1]
  *
  |__discarded(anticoagulation)
  |  |__treatment(anticoagulation)

>> discarded(specific_education)	[1]
  *
  |__discarded(specific_education)
  |  |__treatment(specific_education)

>> discarded(exercise_training)	[1]
  *
  |__discarded(exercise_training)
  |  |__treatment(exercise_training)

>> discarded(sodium_restriction)	[1]
  *
  |__discarded(sodium_restriction)
  |  |__treatment(sodium_restriction)

>> discarded(continuous_positive_airway_pressure)	[1]
  *
  |__discarded(continuous_positive_airway_pressure)
  |  |__treatment(continuous_positive_airway_pressure)

>> discarded(cardiac_rehabilitation)	[1]
  *
  |__discarded(cardiac_rehabilitation)
  |  |__treatment(cardiac_rehabilitation)
