A quartet, denoted {a,b}∣{c,d}, represents the relative order of four taxaa, b, c, and d
in a phylogeny. Specifically, it means that there exists an edge of the tree whose removal
separates the tree into one component containing a and b and another containing c and d.
For example, note that {a,b}∣{c,d} is the only allowable quartet in the
tree below.
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