Thanks for the response Ken. I have tried 3 ways but all of them throwing error:

1). As suggested:

@{$difference[0]}
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Error -- >Can't use string ("ARRAY(0x2c992e0)") as an ARRAY ref while 
+"strict refs" in use at
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2). Tried 2nd way

@{$difference}
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Error as below -- >

Global symbol "$difference" requires explicit package name at 
Global symbol "$intersect" requires explicit package name at 
Global symbol "$union" requires explicit package name at .
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3). tried 3rd way

@difference
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DEBUG: - difference links values ARRAY(0x32690e0) ARRAY(0x3269090) ARR
+AY(0x322d040) ARRAY(0x3276990) ARRAY(0x322d060) ARRAY(0x3269f80) ARRA
+Y(0x3269040)
DEBUG: - intersect links values
DEBUG: - union links values ARRAY(0x32690e0) ARRAY(0x3269090) ARRAY(0x
+322d040) ARRAY(0x3276990) ARRAY(0x322d060) ARRAY(0x3269f80) ARRAY(0x3
+269040)
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Expected output should be device names(e.g ..ABC-DCFE41->90) so that I can remove difference part one by one from the data set.