Spark code to find users having same or mirror DNA

Problem

Write a Spark code to find users having same or mirror images of DNA in the file stored in HDFS.

Dataset

The file is located at

/data/mr/dna/dna.txt

Sample Output

Output file will contain the users having same or mirror DNA

['User5', 'User3']
['User4', 'User2', 'User1']