Open IE methods (Mausam et al., 2012;Del Corro and Gemulla, 2013) capture triples (or quadruples) such as Obama, has, two children .
stateof-the-art Open-IE systems either hardly extract cardinality information or fail to extract cardinal-   Definition We define a mention that expresses relation cardinalities as the following: "A cardinal number that states the number of objects that stand in a specific relation with a certain subject."