I found this example in a book It's about Homophonic substitution and I can't figure how they did it , I mean how the other letters where substituted Here's the example Suppose the alphabet is mapped into the numbers 1 to 99 then map E to 17,19,23,47,64 map A to 8,20,25,49 map R to 1,29,65 map T to 16,31,85 but otherwise the ith letter maps to the 3ith letter Then the cleartext MANY A SLIP TWIXT THE CUP AND THE LIP will become 08 20 16 3185 17 25 16 47 3608397220543324451666246931852117066045253909162147332445 My question is what/how did they represent the other letters like L (etc.) coz I've tried to map them and yet I still can't understand I even wrote A to Z then map them to 1 to 99, I still can't figure it out. Could you also give me an example for polygram substitution. Thank you very much. SALAMAT PO. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Some people they might say that I'm hard to get to know. I go my own sweet way, well that maybe so. Something about the crowd that makes me walk alone. I never had a need in me to be the party's life and soul. It's me Bernie. metaphone@altavista.net ``````````````````````````````````````````````````````````````````````````````