Incorrect example explanation

[Classpi]

The description of the unigram tokenization unigram in the article seems to be incorrect? see this

Here are the frequencies of all the possible subwords in the vocabulary:
("h", 15) ("u", 36) ("g", 20) ("hu", 15) ("ug", 20) ("p", 17) ("pu", 17) ("n", 16) ("un", 16) ("b", 4) ("bu", 4) ("s", 5) ("hug", 15) ("gs", 5) ("ugs", 5)

The tokenization probability of ["p", "u", "g"] for "pug" is 5/210 * 36/210 * 20/210

Shouldn't it be 37/210 * 36/210 * 20/210? I'm also a beginner so I'm not sure if he is correct...