Pre-Code Hollywood refers to the brief era in the American film industry between the widespread adoption of sound in pictures in 1929 and the enforcement of the Motion Picture Production Code censorship guidelines, popularly known as the "Hays Code", in mid-1934. Although the Code was adopted in 1930, oversight was poor and it did not become rigorously enforced until July 1, 1934, with the establishment of the Production Code Administration (PCA). Before that date, movie content was restricted more by local laws, negotiations between the Studio Relations Committee (SRC) and the major studios, and...

In the context of combinatorial mathematics, stars and bars is a graphical aid for deriving certain combinatorial theorems. It was popularized by William Feller in his classic book on probability. It can be used to solve many simple counting problems, such as how many ways there are to put n indistinguishable balls into k distinguishable bins. == Statements of theorems == The stars and bars method is often introduced specifically to prove the following two theorems of elementary combinatorics. === Theorem one === For any pair of positive integers n and k, the number of k-tuples of posi...