Question: Leonard Norman Wein, was an American comic book writer and editor best known for co-creating DC Comics' Swamp Thing and Marvel Comics' Wolverine, and was the editor for writer Alan Moore and illustrator Dave Gibbons' influential DC miniseries "Watchmen", Watchmen is an American comic-book limited series published by DC Comics, in which years?
{'answer': '1986 and 1987', 'supporting_facts': [['Len Wein', 1], ['Watchmen', 0]]}