Input (grade 5): Other noteworthy hard SF authors include Isaac Asimov, Arthur C. Clarke, Hal Clement, Greg Bear, Larry Niven, Robert J. Sawyer, Stephen Baxter, Alastair Reynolds, Charles Sheffield, Ben Bova, and Greg Egan.
Output (grade 4): Other noteworthy hard SF authors include Arthur C. Clarke, Hal Clement, Isaac Asimov, Greg Bear, Larry Niven, Robert J. Sawyer, Stephen Baxter, Alastair Reynolds, Charles Sheffield, and Greg Egan.