Absent friends

Rico says he went to sleep remembering Arnold Bank, one of his professors at Carnegie-Mellon, many years ago.
Rico considers himself lucky to have had him as a teacher. (He died in 1986, a decade after Rico left CMU.)
A classic Bank line about a piece of student calligraphy (not Rico's, fortunately): "The E ! You killed the E !"
He was a genius. Rico misses him.