Narsingh Deo's comments suggests an alternative metric of survivability (pairs of stations in communications) to the one Paul Baran, the original author, chose to use in a recent paper on survivable communications (number of stations in communications with all, see ibid., vol. CS-12. pp. 1-9, March 1964). Deo's point (ibid., vol. COM-12, pp. 227-228, December 1964) is well stated and the original author would like to add to Deo's remarks.