old_contents: // @flow
  
  /**
   * @fileOverview Mathematical utilities
   * @namespace math
   */
  
  import clamp from './math/clamp';
  import nthroot from './math/nthroot';
  import simplify from './math/simplify';
  
  export { clamp, nthroot, simplify };
  
  export default
  {
    clamp,
    nthroot,
    simplify,
  };
  
new_contents: // @flow
  
  /**
   * @fileOverview Mathematical utilities
   * @namespace math
   */
  
  import clamp from './math/clamp';
  import nthroot from './math/nthroot';
  import simplify from './math/simplify';
  import gcd from './math/gcd';
  
  export { clamp, nthroot, simplify, gcd };
  
  export default
  {
    clamp,
    nthroot,
    simplify,
    gcd,
  };
  
subject: add gcd import