Three English profs of literature encountered several ladies of pleasure patrolling the street.
"What might one call such a congregation?" mused the first professor, who as a Shakespearean specialist. "A flourish of strumpets?"
The second professor, an authority on the novels of Anthony Trollope, said, "A chapter of trollops?"
But the best description came from the third, a young generalist who proclaimed, "An anthology of pro's."