General Double Rotation

• Height of subtree still the same as it was before insert!

• Height of all ancestors unchanged.

a

Z

b

W

c

X

Y

a

Z

b

W

c

X

Y

h

h - 1?

h - 1

h - 1

h + 2

h + 1

h - 1

h - 1

h

h + 1

h

h - 1?

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