Challenge Eight - second clue

Had a request to say a bit more about step 2. think about what Aggie does. First she substitutes pairs of letters for individual letters. Next she writes the new text (which just uses six lettters used over and over again) in columns so the first two columns go together then the next two go together and so on . Then she shuffles the columns. When she does that she breaks up[ the pairs (if the first four characters are now CVSE the CV go together and the SE together before shuffling. Maybe after shuffling she gets CEVS splitting up the CV and the SE and switching the order of the S and the E). Step two is a description of how to see which columns pair up (in the example it would tell you to pair column one with column three and column two with column four). So for example you try pairing columns and and two and do a frequency analysis on the letter pairs that gives from those two columns. Next you pair one and three and do the frequency analysis for that pairing and so on. One of the pairings (one with something) will give you a much rougher distribution - fewer pairs will be used and one or two will be used much more than the others etc.. That one is the correct pairing for column one (in the example you would see ti was the pairing of column one with column three) Next you repeat to find out what to pair the next column with and so on. All the best,