cost for each of these rows to be 1. Now, consider the critical row of type \[type:BBB\]. This row is of the form $\langle ?, u, u\rangle$ and it must pay a base cost of 1, since it involves a special symbol. The base cost of the critical row is deemed to be 1. A type \[type:CCC\] row (of the form $\langle ?, u, ?\rangle$) must pay cost of at least two, since it has two special symbols. The base cost of such a row is deemed to be 2. By similar arguments, we see that any other type of row must pay a base cost of 1. To summarize, every row of type \[type:CCC\] (of the form $\langle ?, u, ?\rangle$) pays a base cost of 2, whereas any row of any other type pays a base cost of 1.

For each vertex $u$, the total base cost across the 20 rows can be calculated as follows: (i) The six (type \[type:AAA\]) rows of the form $\langle 0, u, u\rangle$ pay a cost of $6$ in total; (ii) The critical row (of type \[type:BBB\]) pays a cost of $1$; (iii) The seven (type \[type:CCC\]) rows of the form $\langle 