sentences:  A "tandem" hitch has one rear animal in shafts, then one or more others hitched ahead of the first in single file.Larger teams are usually in pairs, with four, six or even more animals overall; driving these is known as driving "four-in-hand", "six-in-hand" etc.Sometimes other arrangements are used, such as the "unicorn" (one animal in front of a pair), and the "pickaxe" (three animals in front of a pair).