How many countries are there in the region whose comment description is "asymptotes sublate after the r."
r_comment = 'asymptotes sublate after the r'; countries refer to n_nationkey;
SELECT COUNT(T1.n_nationkey) FROM nation AS T1 INNER JOIN region AS T2 ON T1.n_regionkey = T2.r_regionkey WHERE T2.r_comment = 'asymptotes sublate after the r'