###Instruction: Multi-class classification, answer with one of the labels:['no_consensus', 'delete', 'keep', 'comment', 'merge', 'redirect'] : ###Input:  Q6589601: primary radar (Q6589601) : radar sensor that illuminates a large portion of space with an electromagnetic wave and receives back the reflected waves from targets within that space : ( delete | history | links | entity usage | logs ) Already existed as Q2110245 Wikijens ( talk ) 20:11, 9 March 2013 (UTC)