Find duplicate keywords, and list maximum

Hello,
I am trying to create a macros that does the following.
I have rows of 10 keywords. I want the macros to compare the first row against all the rows except itself, then compare the second row against all the rows except itself, the third row against all the rows except itself, basically looking for duplicates...It will then record in a column for each respective row, the max # of duplicates found with another row..

For instance lets say I was looking at the 15th row, and it looked for duplicates elsewhere. It only found duplicates in the 4th row and the 5th row. In the fourth row, there were 5 keywords common, and in the 5th row there were 7 keywords common. Therefore the max # of common words is 7 for the 15th row, and that is what is recorded.

In addition the number of rows will probably vary it could range from 1 to 500. I included an excel spreadsheet that has visually speaking how this could work, maybe using COUNTIF. Basically it counts the # of common keywords for one row with all the other rows, pastes the count #s to the right, then finds the max of those count #s, copies the max into another column, then clears the count #s, and looks up the next row, repeats the same process. It is easier probably if you look at the attached spreadsheet to get an idea of what i am talking about..