11 11111 41 11111 12 1 42 1 13 1 43 1 14 44 1 15 111111111 45 111111111 16 46 17 1 47 18 111 48 11 19 111 49 111 20 1111 50 11111111 21 1 51 22 11 52 1111 23 111 53 111 24 11 54 11 25 111 55 1 26 1 56 1 27 57 28 11111 58 11111 29 11 59 11 30 60 31 1 61 1 32 11 62 1 33 11 63 1 34 64 1 35 65 1 36 1 66 Each of these tables looks like the normal frequency table except for the position of 20 and 50 which should represent T, by all our rules, and should be apparently 30 and 60. But suppose we put the alphabet and corresponding numerals in this form: 1 2 3 4 5 6 7 8 9 0 1 or 4 A B C D E F G H I J 2 or 5 K L M N O P Q R S T 3 or 6 U V W X Y Z Then A=11 or 41, J=10 or 40 and T=20 or 50 as we found. Using the above alphabet, the message may easily be read. Note that this cipher is made up of ten characters only, the Arabic numerals. Case 9c-- Message 1156254676 2542294432 1949294015 1423217211 2979703115 4924213511 7424147875 7646252444 5143254845 3179742533 4055461512 7573227945 1627481511 7042351944 1378252149 2514764553 1548342126 7215254075 1611257845 4642217415 4952197929 7015242143 2925444933 1970187531 4079254829 4551491411 7321171554 An examination of this message shows it to consist of forty-four different two-figure groups running from 11 to 79. Let us prepare a frequency table of these groups. Group Frequency