To obtain more complete tables of letter sequences varying in order of approximation to English than those generally available, sequences of zero through fourth-order approximation were computer-generated using tables of single-letter, digram, trigram, and tetragram frequencies. Two sets of tables are presented. One consists of 100 randomly selected 10-letter sequences of each of zero to fourth-order material. The other consists of 40 8-letter sequences of each type, selected with the restriction that no letter appear more than once in the sequence.
The resulting strings of letters, in attempts to manipulate (1951) employed a guessing technique making use of the alphabet.