People's Education Edition, Grade Six, Volume One, Basic Mathematics Training, Page 63, Mathematical Wisdom Garden
Two birds add up to a *** 18 and 10, so there are 52, 50 and 50 of the 68 tails, that is, five nine-headed birds and five Kyubi no Youko, and the remaining two heads and 18 are just two Kyubi no Youko birds, so there are five nine-headed birds in a * * *.