To begin, let's identify the letter's position in the alphabet and look for a . Notice that we have two M's.
4 ABCDE2 FGHI1 JKL3,5 MNOPQRSTUVWXYZExamining the diagram, we cannot discern any pattern. Therefore, the letters must represent something else than their position in the alphabet. Well, how about the months of the year? The only month with a name that begins with J is January, and the only month with a name that begins with F is February.
January,February,March,April, May
Therefore, the pattern starts with the first month of the year and then goes forward by one month. With this information we can write the next two letters in the pattern.
J, F, M, A, M, J, J,...