It is relatively easy for the parties to exclude the postal rule: in typical American-style crossword puzzles, the theme is first created, because a series of long symmetrical across responses are needed around which the grid can be created. [64] [65] Since the grid typically exhibits 180-degree rotation symmetry, the answers should also be: Therefore, a typical 15×15 square American puzzle may have two 15-letter entries and two 13-letter entries that could be appropriately arranged in the grid (e.g. B one entry of 15 letters in the third line and the other symmetrically in the 13th line; one entry of 13 letters, which begins in the first square of the 6th line) and the other ends in the last square of the 10th row). [65] [66] The subject must not only be funny or interesting, but also coherent internally. . . .