The letters a,b,c,. . .,x,y,z appear, in an English text, with the following frequencies.
Letter a b c d e f g h i j k l m
Frequency (%) 8.2 1.5 2.8 4.3 12.7 2.2 2.0 6.1 7.0 0.2 0.8 4.0 2.4
Letter n o p q r s t u v w x y z
Frequency (%) 6.7 7.5 1.9 0.1 6.0 6.3 9.1 2.8 1.0 2.4 0.2 2.0 0.1