the 25 subsequent turns proceed consecutively through the letters of the alphabet, one letter per turn. in a turn, each player writes one entry that begins with the turn's specified letter. if one or more undefined entries are available that begin with the letter, a player must choose and write an undefined entry before any new entries can be created under that letter. a new entry must create and link to two undefined entries, and must also link to an entry written on a previous turn. near the endgame, when sufficient undefined entries exist to occupy all players for the remainder of the game, no new undefined entries may be created.