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Pasty_Spumante
Picture of the cage might help....
For short cage Shimano say max. cassette 27, max. capacity 29.
You'll be exceeding the capacity by 4: (50-34)+(28-11)=33. However Shimano are pretty conservative and unless you have exceedingly long CS it will most likely work (and shouldn't be riding in small/small or big/big anyway).