(37 # _ )
/ \
/ \
/ \
(21 # 29) (50 # 70 # 80)------------
/ | \ / \ \ |
/ | \ / \ \ |
(7,9,11) (21,23) (29,30) (37,49) (50,69) (70,75) (80,105)
Yes, you must have noticed that this tree (despite
having the leaves on the same level and the search
property in good order) has one node with too many
children.