Write a Java program that displays all 4-character strings in lexicographic order (also called dictionary order) on the screen. It must display a string of 4 characters per line. Only the characters a, b, c, d are allowed within character strings

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Write a Java program that displays all 4-character strings in lexicographic order (also called dictionary order) on the screen. It must display a string of 4 characters per line. Only the characters a, b, c, d are allowed within character strings