###Instruction: Multi-class classification, answer with one of the labels:['no_consensus', 'delete', 'keep', 'comment', 'merge', 'redirect'] : ###Input:  Q1286302: reflection principle (Q1286302) : theory in which it is possible to find sets that resemble the class of all sets has such a principle : ( delete | history | links | entity usage | logs ) Duplicate of Q7307249 Chricho ( talk ) 10:27, 21 March 2013 (UTC)