Q: How many IBM types does it take to change a light bulb?
A: Fifteen. One to do it, and fourteen to write document number
GC7500439-0001, Multitasking Incandescent Source System Facility,
of which 10% of the pages state only “This page intentionally
left blank”, and 20% of the definitions are of the form “A:…..
consists of sequences of non-blank characters separated by blanks”.