How to compare some pdf files

Hi all,
I have some pdf files in the folder, i want to compare these pdf files one by one, because there are some files with the same content,this is one of the cases.
And another type is, for example, two files are connected together. Maybe the next two are the same as before. I need to delete the duplicate PDF.
The attachment files as below (199.2 KB)
In the folder, file 3 and file 4 is same; file 13 & 14 and file 15 & 16 is same, so i want to delete file 4 and file 15 & 16, Please give me some sample, thank you!

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