While reading the "scrum handbook" published by you from Scrum.inc; In the initial paragraph:
"At the beginning of each Sprint, a cross-functional team selects items (customer requirements) from a prioritized list. They commit to complete the items by the end of the Sprint. During the Sprint, the chosen items do not change. Every day the Team gathers briefly to replan its work to optimize the likelihood of meeting commitments."
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Sprint backlog
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