beulah / kirky....N must be less than 32, otherwise NUN would be more than the three digits long. N is a reverse prime, so the only possibilities are 11, 13, 14, 16, 17 or 31. It cannot be 11 as you are not permitted to have two adjacent cells containing the same digit.
There are then 18 possible values for NUN, of which only three are reverse primes. Happily, all three have the same value for N ! Then look at clues F, H and I for the next steps.