Analysis position introduction of crime to other crimes, in Iran Criminal law

One of the severe qualities of punishments is plurality of crimes, it is divided into two types: actual and credit. About number of crime. Criminal lawyers believe to guilty punish severely, while .this view is not about the number of credit. But, regarding to examples of number of actual and credit there is disagreement, one of the differences is that a criminal during commit a crime, that is his/her main purpose, do another crime as an introduction of original crime. Now, the question is this situation the preliminary crime should be inside of main crime and believes in the unity of crime or it is one of the example of number crime (actual)? The Iranian Penal Code is silent about the topic under discussion but with reference to the doctrine and jurisprudence, it was necessary to consider this point that in the Iran's current criminal law, "give priority a crime to another” is one of the examples of actual plurality of crime.