I have 30 seperate files which are opened individually and from each file infomation is extracted,
e.g for files 1 and 2:

file 1:
N(8) -- H(15) .. O(9)
N(8) -- H(16) .. O(9)

file 2:
N(8) -- H(15) .. O(9)
N(8) -- H(15) .. N(8)
N(8) -- H(16) .. O(9)

Note all the information from all 30 files is stored in an array called @contact_type.
What I want to do is go through @contact_type and list the lines which contain the pattern /H\(d+\)/ more then once.
So iterating over the information from file 1 should not output any lines, but from file 2 both the H(15) lines should be displayed as H(15) is repeated in both.
Note I wish to write this as general as possible as letters and numbers can change.

Cheers Harry

In reply to duplicate lines in array by harry34

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