sentences:  I favor using lots of book titles, play titles, names in the news, and so on.I also favor puzzles with a unifying theme—what I call the inner-clue puzzle, which was invented by one of our best constructors, Harold T. Bers.For example, an inner-clue puzzle he did for us recently was called 'Catalogue' and had answers that were words or phrases like 'catbird seat,' 'catacombs,' 'Kitty Hawk,' and 'pussyfoot.'"