Now we can complete the B section of the table. When A = 0 (the first
two rows of both columns), JB = KB = 1 and B changes state. When
A = 1, JB = KB = x. For x = 0 (the first column, last two rows), B
remains unchanged. Finally, for A = 1 and x = 1, JB = KB = 1 and B*
changes, producing the completed Table 6.9c.