Question: Considering the call-return pattern in Figure 4.21, number of overflows and underflows (each of which causes a register save/restore) will occur with a window size

Considering the call-return pattern in Figure 4.21, number of overflows and underflows (each of which causes a register save/restore) will occur with a window size of
8 -> window size 8 : Why total number of underflows and overflows are 8?
16 -> window size 16: Why total number of underflows and overflows are 0?
Time (in units of calls/returns) Return Call Nesting depth Figure 4.21 Example Call-Return Behavior of a Program
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