Note that your data above is not the same as your original posting - you've added another entry to the start of each row. Do you have code that already reads in your data and generates the actual data structure, or are you just working off input files? Posting code that generates the desired structure makes sure we are working with the same beast you are working with and makes our lives easier. There is no good reason for us to try and guess at what you have and what you need - we are doing you a favor.