  As Figure 11 makes clear, acknowledging the existence of SPX does not commit us to recognizing any experiences in addition to C-D-E-F, for SPX is composed of the second-half of SP1 (= D) and the first-half of SP2 (= E). To put it another way, there is a D-type experience to be found in SP1 and also in SPX, but there are not two token D-type experiences, for the simple reason that the D-token in SP1 is numerically identical with the D-token in SPX, and similarly for E. By holding that specious presents can overlap by sharing common parts, phenomenal continuity can be secured in an economical manner. As Foster puts it: ‘where the successive patterns overlap, the experiences which present them overlap in a corresponding way’ (1991: 249).