Find Candidates for Data Scientist Position

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Example Testcases:

{"headers":{"Candidates":["candidate_id","skill"]},"rows":{"Candidates":[[123,"Python"],[234,"R"],[123,"Tableau"],[123,"PostgreSQL"],[234,"PowerBI"],[234,"SQL Server"],[147,"Python"],[147,"Tableau"],[147,"Java"],[147,"PostgreSQL"],[256,"Tableau"],[102,"DataAnalysis"]]}}