sentences:  Baronova and Toumanova were pupils of Olga Preobrajenska; Riabouchinska was a protégée of Mathilde Kschessinska.Impressed by their remarkable talent, and cognizant that each of them had had some performing experience, Balanchine chose them to dance in a new company that was then being formed by René Blum and Colonel Wassily de Basil and of which he was to be chief choreographer, Les Ballets Russes de Monte Carlo.During their first season with the company, in the spring of 1932, Baronova and Toumanova were 12 years old, and Riabouchinska was 14.