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extract property value from set of json arrays

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I have the following in a postgresql table
row 1: {"a": 1, "b": "[{"c": "123", "d":"456", "e": "789"},  {"c": "222", "d":"111", "e": "000"} ]"}
row 2: {"a": 2, "b": "[{"c": "XXX", "d":"YYY", "e": "ZZZ"},  {"c": "666", "d":"444", "e": "333"} ]"}

How do I pullout all "b":"e" values  and end up with this result:
789
000
ZZZ
333



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