  Channel codes for relayless networks with the general message access
structure is introduced. It is shown that the multi-letter characterized
capacity region of this network is achievable with this code. The capacity
region is characterized in terms of entropy functions and provides an
alternative to the regions introduced by [Somekh-Baruch and Verd\'u,
ISIT2006][Muramatsu and Miyake, ISITA2018].
