(29 # _ )
/ \
/ \
/ \
(21 # _) (37 # 50 )
/ \ / | \
/ \ / | \
(7,9,11) (21,23) (29,30) (37,49) (50,100)
Insertion of 22,40,70 would not cause the root to split.
The "22" key would simply fill the second leaf from
the left.
The "40" key would simply fill up the second leaf from
the right.
The "70" key would simply fill up the rightmost leaf.
In fact, no split would be needed, at all.