to be mapping so a one can map to B 1 a 2 map to beat you but then it's also possible that a 1 can be mapped to beat you a to map to b1 and will still be fine form a marginal matching perspective but then the problem is so well then that means this thing is ambiguous and this is not just hopes sorry mainly joyed the other way so there are two set of mappings that we are we need to learn here one is G a B which is mapping from A to B and then another set of things is another set of things that we need to learn is GPA and