claim: Milk is based on the life of a Boston mayor.
evidence: A yoke is a wooden beam normally used between a pair of oxen or other animals to enable them to pull together on a load when working in pairs , as oxen usually do ; some yokes are fitted to individual animals .. beam. Beam ( structure ). oxen. oxen. There are several types of yoke , used in different cultures , and for different types of oxen .. oxen. oxen. A pair of oxen may be called a yoke of oxen , and yoke is also a verb , as in `` to yoke a pair of oxen '' .. oxen. oxen. Other animals that may be yoked include horses , mules , donkeys , and water buffalo .. water buffalo. water buffalo