During this period, the hydrologist Lǐ Bīng planned an irrigation system in the Mín Valley (10[1])called the Dūjiāngyàn. (10[1]-5[1])During a siege around the start of this period, the diversion of the Fén River forced the people of Jīnyáng to live on top of their houses. Perhaps (10[1])the oldest known multiplication tables were found on bamboo strips from a tomb dating to this period. (10[1]-5[1])An attack during this period inspired the phrase (-5[1])“Besiege Wèi to rescue Zhào.” During this period, the philosopher (-5[1])Mèngzǐ (“MUNG-dzih”) taught at the Jìxià (-5[1])(“jee-sh’yah”) Academy. A text of strategies (10[1])composed around the transition (-5[1])into this period, which some mark by the Partition of Jīn, (-5[1])is attributed (10[1])to an (-5[1])earlier period’s general (-5[1])Sun Tzu. (-5[1])For 10 points, identify this period named for polities like Yān (10[2]-5[1])(“yen”) and Chǔ that (10[1])came after the Spring and Autumn Period (10[1])and ended with unification (-5[1])under the Qín (10[1])■END■ (10[6]0[5])