Suppose that a client performs an intermixed sequence of (stack) push and pop operations. The push operations put the integers 0 through 9 in order on to the stack; the pop operations print out the return value. Which of the following sequences could not occur? (a) 4 3 2 1 0 9 8 7 6 5 (b) 4 6 8 7 5 3 2 9 0 1 (c) 2 5 6 7 4 8 9 3 1 0 (d) 4 3 2 1 0 5 6 7 8 9 (e) 1 2 3 4 5 6 9 8 7 0 (f) 0 4 6 5 3 8 1 7 2 9 (g) 1 4 7 9 8 6 5 3 0 2 (h) 2 1 4 3 6 5 8 7 9 0
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