 Complete the following phrase:  By 1971, Brezhnev had succeeded in becoming first amongst equals in the Politburo and the Central Committee. Six years later, Brezhnev had succeeded in filling the majority of the Central Committee with Brezhnevites. But as Peter M.E. Volten noted, the relationship between the general secretary and the central committee remained mutually vulnerable and mutually dependent. The collective leadership of the Brezhnev era emphasised the stability of cadres in the party. Because of this, the survival ratio of full members of the Central Committee increased gradually during the era. At the 