This function outputs the leaves of the tree as an object of class Set.
i1 : T = leafTree(4,{{0,1}});
i2 : vertices T
o2 = {set {set {0, 1}, set {2}, set {3}}, set {set {0, 1, 2}}, set {set {0,
------------------------------------------------------------------------
1, 3}}, set {set {0}, set {1}, set {2, 3}}, set {set {0, 2, 3}}, set
------------------------------------------------------------------------
{set {1, 2, 3}}}
o2 : List
i3 : #(vertices T)
o3 = 6
Caveat
The leaves have a different representation from the one in the output of vertices(LeafTree).