A bill which reaches the floor of the full house can be simple or complex and begins with an enacting formula such as "Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled..." Consideration of a bill requires, itself, a "rule" which is a simple resolution specifying the particulars of debatetime limits, possibility of further amendments, and such. Each side has equal time and members can yield to other members who wish to speak. Sometimes opponents seek to "recommit" a bill which means to change part of it. Generally, discussion requires a "quorum", usually half of the total number of representatives, before discussion can begin, although there are exceptions. The house may debate and amend the bill; the precise procedures used by the House and Senate differ. A final vote on the bill follows.