Typos on page 64

[Zbigniew-Kaleta]

Second paragraph on page 64: In particular, if you take a binary data set if flip what it means to be a positive or negative example, you will end up with completely difference precision and recall values I believe the highlighted words should be 'and' and 'different'.

Also (third paragraph from the bottom): Unlike f-measures,which tend to be low because the require agreement, AUC scorestend to be very high, even for not great systems. I think it should read "because of the required agreement".