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[Num Bits] log2(groupsize) [Benefits] Indicate which subtable we belong to in a shared subtable. With one of the two above, avoids rehashing when splitting shared subtable. Helps searching to a lesser extent (only on shared subtable). [Name] 
Shared Bucket
S u b t a b l e B i t
E x t r a H a s h B i t s
H a s h T r u n c a t e d B i t
H o m e B u c k e t
I n H o m e B u c k e t
S h a r e d B u c k e t
D e l e t e d B i t
C o l l i s i o n B i t
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