4.4.1 A Note About Distance and Labels

One thing to note is that when we compute the distance between two tables, we ignore the labels: i,j range over rows and columns, not over labels.

Roadmap
Section 3.7	Encipher plaintext $\Rightarrow$ scramble frequencies.
Section 3.7	Decipher ciphertext $\Rightarrow$ unscramble frequencies.
Section 4.2	(Hope) Unscramble frequencies $\Rightarrow$ decipher ciphertext
Section 4.3	Unscramble = Bring ``close'' to intrinsic frequencies
	Approximate intrinsic frequencies with training text
	Assume ciphertext is medium to large so that unscrambled frequencies resemble intrinsic frequencies
Section 4.4	Use the L1 distance to measure ``closeness''; ignore labels.
$(\rightarrow)$     Section 4.5	Q: What distances count as ``close''?
Section 5	Q: What are legal and effective ways to rearrange frequencies?