Doublet is a
game Lewis Carroll, author of Alice in Wonderland, invented. The object of the game
DOUBLET is to change a word into another word by successively changing only
one letter at the time to form an intermediate valid word. For example, the
following process changes the word HIT to OUT:
Mathematicians have tried in vain to this day
to discover some order in the sequence of prime numbers, and we have
reason to believe that it is a mystery into which the human mind will
never penetrate.