furc(x,xpos,yrange,toplevel,cex=1)
dendrite
object containing the counts of objects having
combinations of mutually exclusive attributes.furc
displays one furcation of the dendrogram. A furcation is
a single box displaying its label and count that may split into finer
divisions. If so, furc
calls itself for each furcation until there are
no more splits.plot.dendrite