Or do we really need to pass these unfortunate i1, i2, i3, i4 to avoid loss, and then do XOR(i1, i2), XOR(i1, i3), XOR(i1, i4)?
That results in three XOR operations. Although, I still see that it doesn't work; we can come up with an example. Sigh.
New here? I'm Roha — want a quick tour?