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when toggle format what by license comment
Oct 30, 2014 at 16:59 comment added Yanqi QIU Oh, yes, I didn't pay attention to that, sorry.
Oct 30, 2014 at 14:20 comment added Mustafa Said $B$ and $C$ have to be the same rank.
Oct 30, 2014 at 13:23 history answered Yanqi QIU CC BY-SA 3.0