information maybe some key strokes are far less likely than others so maybe the ones that are less likely you should allow it to use more bits and the ones that are very likely you should try to represent with a very small number of bits and overall you might have a win that's the intuition behind law compression schemes but obviously here everything seven bits that's not going to happen let's in at least a reference as a starting point so we'll need a spare be length codes codes down assign different lengths depending on how likely a symbol