Check that the 𝒜(𝒟)² in the example is itself the adjacency matrix of the indicated digraph:

[…] his signature song was El Baile del Pingino (The Penguin Dance), which he illustrated with side-to-side, penguinlike movement in perfect time.

Many religious people believe in an afterlife.

Oh Lord, sir,' answered Job, who now perceived the object for the first time,I think that the old geneleman must have been sitting for his portrait on them rocks.'