This is really simple. You'll notice that each replaced phase was a 0 or 1 -- a bit. So to scale to 256 you only need 8 (2^8)of those option phrases, or to 65536 16 (2^16) phrases. Such would be easy in an email the length that was posted.
"Never ascribe to malice that which is caused by greed and ignorance." -- Cal Keegan