11 111111 12 1 13 1 14 1111 15 111111111 16 11 17 1 18 1 19 1111 20 21 1111111 22 1 23 1 24 1111 25 11111111111 26 1 27 1 28 29 111111 30 31 111 32 1 33 11 34 1 35 11 36 37 38 39 40 1111 41 42 111 43 11 44 1111 45 11111 46 1111 47 48 1111 49 111111 50 51 11 52 1 53 1 54 1 55 1 56 1 57 58 59 70 1111 71 72 11 73 11 74 111 75 1111 76 111 77 78 111 79 11111 We at once note the resemblance between the frequency tables for the groups 11 to 19 and 21 to 29; for the groups 30 to 36 and 50 to 56; and for the groups 40 to 49 and 70 to 79. Also the groups 11 to 19 and 21 to 29 have a frequency fitting well with the normal frequency table of the letters A to I; the groups 41 to 49 and 71 to 79 have a frequency fitting well with the normal frequency table of the letters K to S; and the groups 31 to 36 and 51 to 56 have a frequency fitting well with the normal frequency table of the letters U to Z. We have J and T unaccounted for, but note what occurred in Case 9-b and that 40 and 70 would correspond well with T if they followed respectively 49 and 79. We may now make up a cipher table as follows: 1 2 3 4 5 6 7 8 9 0 1 or 2 A B C D E F G H I J 4 or 7 K L M N O P Q R S T 3 or 5 U V W X Y Z and this table will solve the cipher message.