###Instruction: Multi-class classification, answer with one of the labels:['no_consensus', 'delete', 'keep', 'comment', 'merge', 'redirect'] : ###Input:  Q1420822: luminosity (Q1420822) : number of particles per unit area per unit time times the opacity of the target : ( delete | history | links | entity usage | logs ) Was duplicate of Q6703296 . -- Mfb ( talk ) 11:23, 17 April 2013 (UTC) 