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No.1:  The following dictionary of dates and stock prices is defined in the scaffold below: prc_dic = { ‘3000-01-15’: 7.0400,   ’2020-01-14′: 7.1100,   ’2020-01-13′: 7.0200,   ’2020-01-02′: 7.1600,   ’2020-01-03′: 7.1900,   ’2020-01-06′: 7.0000,   ’2020-01-07′: 7.1000,   ’2020-01-08′: 6.8600,   ’2020-01-09′: 6.9500,   ’2020-01-10′: 7.0000,  } ...