In the February and May issues of Word Ways, Lee Sallows describes how he constructed a pangram machine (a special-purpose digital computer) to discover self-referential sentences of the form "This sentence contains five a's, two b's, ... and one z", after he realized that the program he had written for a general-purpose digital computer would trake 31.7 million years to run. There's no doubt that building the pangram machine was a personally satisfying accomplishment -- although I am afraid that it became his Galatea.
"On Pruning Trees for Pangrams,"
Word Ways: Vol. 25
, Article 8.
Available at: https://digitalcommons.butler.edu/wordways/vol25/iss3/8