sentences:  Near the end of June 1872, Nikola Obretenov transported the printed statutes, the receipts and other documents, as well as Levski's uniform, sabre, and gun through the developed illegal channel, assisted by baba Tonka, Petrana Obretenova, Todorka Mirazchieva, and Natalia Karavelova.In 1873 Nikola Obretenov made an acquaintance with Stefan Stambolov, who expressed his willingness to get involved in the struggle as Vasil Levski's deputy.On 20 August and 21 August 1874 Nikola Obretenov took part in BRCK's session in Bucharest, which re-elected Karavelov as a chairman of the committee, elected Hristo Botev as a secretary, and confirmed Stefan Stambolov as a chief apostle in Bulgaria and a deputy of Vasil Levski.