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]= rightmost point of a sorted subgroup
[= leftmost point of a sorted subgroup
...
[ 1 3 7 11 15 17 |27 32 35 54 59 60 63]^[23 24| 29]
[ 1 3 7 11 15 17 23 24 27| 32 35 54 59 60 63]^[29]|
[ 1 3 7 11 15 17 23 24 27 29 32 35 54 59 60 63]