 The memory criterion came to be modified in two further ways. The first modification provides a way of reconciling the memory criterion with the transitivity of identity in the light of cases such as the elderly general. Instead of saying that A is the same person as some earlier B if and only if A can Q-remember enough of what happened to B, we say the following. A is the same person as B if and only if there is a Q-memory chain linking A with B. For there to be a Q-memory link between A and B, either A remembers enough of what happened to B, or A remembers enough of what happened to someone who remembers enough of what happened to B, or A remembers enough of what happened to someone who remembers enough of what happened to someone who remembers enough of what happened to B, and so on. In the case of the elderly general, the elderly general does remember enough of what happened to, someone, the young lieutenant, who remembers enough of what happened to the young schoolboy to count, by the modified criterion, as the same person as the young schoolboy.