In this representation, each n-gram context h (including the null context for unigrams) is a Chinese restaurant whose customers are the n-gram counts c(w|h) seated over the tables The seatings has been incrementally constructed by choosing the table k for each count in c(w|h) with probability proportional to where c hwk is the number of customers seated at table k thus far and t h• = w t hw is the total number of tables in h. When k = new is selected, t hw is incremented, and this means that the count was actually generated from the shorter context h .
in that case a proxy customer is sent to the parent restaurant and this process will recurse.