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OCR: (a) 3- 6 +12 17 2 + 19 21 -25 -26 NIL (b) -7 -12ks -19 26 NIL (c) 12 -19Ba +25 26 NIL 6 NIL (d) +3 1968 -21:3 26 Figure 1: (a) Finding a particular node; (b) looking at every other node in the list; (c) looking at about every fourth node plus another two; (d) taking a probabilistic approach to skip pointers.