Given an array of words in the singular form, return a set of those words in the plural form if they appear more than once in the array.

Examples

pluralize(["cow", "pig", "cow", "cow"]) ➞ [ "cows", "pig" ]

pluralize(["table", "table", "table"]) ➞ [ "tables" ]

pluralize(["chair", "pencil", "arm"]) ➞ [ "chair", "pencil", "arm" ]

Notes

• This is an oversimplification of the English language so no edge cases will appear.
• Only focus on whether or not to add an s to the ends of words.
• All tests will be valid.