Deduplicate - create powerset

[hobovsky]

Reported on wiki list of duplicates.

1. By the Power Set of Castle Grayskull

• 5kyu
• Input is a list, output is a list of lists
• 93% with 2.1k completions
• 2 pending issues
• 5 languages + 1 pending translation
• Published Jul 2014, author inactive

2. Subsequences

• 6kyu
• Input is a string, output is a list of strings
• 89% with 50 completions
• No pending issues
• JS only (covered by 1.)
• Published Nov 2017, author inactive

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Conclusion

• Keep 1. By the Power Set of Castle Grayskull
• Retire 2. Subsequences

[hobovsky]

Both kata differ by their rank, but I don;t think 5 kyu is much off. I vote to keep 1. because it requires smaller effort with moving languages, but I am fine with keeping 2. and moving languages there too.

[Kacarott]

Keep 1, retire 2.

[KayleighWasTaken]

1 should be kept on language coverage and completion alone. 2 is JS only with 50 completions, just retire it.