How to use:
to start the program, copy the jar file and the cipher text into a directory.
execute the jar file with the cipher text as argument
     e.g. java -jar analisys.jar cipher.txt
the file will give the frequency of the single letters on the cipher, then it give the possible plain text letters based on the english frequency with error of 1%.
then it gives the frequency of bigrams, and the most common ones in english
then it gives the frequency of trigrams, and the most common ones in english

after that it shown the cipher text and let you change the letter to make the plain text.
questions asked is cipher text letter to be changed, the plain text letter to change it into, it gives you the cipher text again and the plain text below for comparison, and finally asks if you want to change another letter.

all answers are in lower case letter.