The first thing I found:

#(16 17 17 16 18 17 18 19�� �� 19 19 18 19 19 20 19�� ��20 19 20 20 20 19 20) groupsOf: 7 atATimeCollect: [ :x | x ]

��"#(#(16 17 17 16 18 17 18) #(19 19 19 18 19 19 20) #(19 20 19 20 20 20 19))"

> On 25 Apr 2017, at 22:08, Stephane Ducasse <stepharo.self@gmail.com> wrote:
>
> #(16�� �� 17 17 16 18 17 18 19�� �� 19 19 18 19 19 20 19�� ��20 19 20 20 20 19 20)
>
> ->
>
> { #(17 17 16 18 17 18 19) . #(19 19 18 19 19 20 19) . #(20 19 20 20 20 19 20)}
>
> any code?