k-d Tree NNS (19)
y
x
a
b
c
g
h
e
d
i
s1
s2
y
y
s6
s3
x
s4
y
s7
y
s8
y
s5
x
s1
s2
s3
s4
s5
s6
s7
s8
a
b
d
c
i
x
f
query point
w
f
h
e
g
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