The two-round system (also known as the second ballot, runoff voting or ballotage) is a voting system used to elect a single winner. Under runoff voting, the voter simply casts a single vote for their favorite candidate. However, if no candidate receives an absolute majority of votes, then all candidates, except the two with the most votes, are eliminated, and a second round of voting occurs.

Runoff voting is widely used around the world for the election of legislative bodies and directly elected presidents. For example, it is used in French presidential, legislative, and cantonal elections, and also to elect the presidents of Argentina, Austria, Brazil, Bulgaria, Chile, Croatia, Cyprus, Dominican Republic, Finland, Ghana, Guatemala, Indonesia, Poland, Portugal, Romania, Serbia, Zimbabwe —see: Table of voting systems by nation.

From Wikipedia under the GNU Free Documentation License
Sun Aug 2 08:45:13 2009

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Emily sitting on top of the flow center The two round black things are the pumps that move water through throughout the geothermal ground loop < Filling the Tubes With Solution |

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2 2 The QEV has three sections the square center section and two round sections Unscrew the round sections from each QEV by gripping each

From Yahoo Image Search: "Two-round system"
Sun Aug 2 03:43:02 2009