binary hash tree
s2,2
s2,1
s2,0
s2,3
s1,0
s1,1
s0,0
s4,0
=
k0
s4,1
=
k1
s4,2
=
k2
s4,3
=
k3
s4,4
=
k4
s4,5
=
k5
s4,6
=
k6
s4,7
=
k7
s4,8
=
k8
s4,9
=
k9
s4,10
=
k10
s4,11
=
k11
s4,12
=
k12
s4,13
=
k13
s4,14
=
k14
s4,15
=
k15
b0
b1
s3,0
s3,1
s3,2
s3,3
s3,4
s3,5
s3,6
s3,7
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