What I mean;
Is the content associated with a leaf also associated with the branch nodes that leaf terminates?
e.g.

Associate an item with “c” and it appears in “a”,”b” and “c”.
I’d like the item to only be associated with “c” not “a” and “b” as well.
Have I missed something or is this correct?
Well, if you don’t want c to imply a and b, then c should be a sibling of a and b, not a child.