chapter 9 / learning as Inference / de Finetti representation of Polya's urn 

1) it would be helpful to see a reference to this very special representation; furthermore it would be informative to recode the algorithm so that it works for different c > 1, where c is the number of replications put back into the urn.

2) Readings/ The link to the reference "Piantadosi et al. (2012)" should be updated.