 Complete the following phrase:  At its core, the Packers sweep was a simple play that relied on all members of the team precisely executing their responsibilities. This level of teamwork, coordination, and execution epitomized the Packers of the 1960s under Lombardi. In nine seasons at the helm, Lombardi and his sweep led the Packers to five NFL championships, as well as victories in Super Bowl I and II. The team won three straight championships in 