[Pharo-users] little "challenge"

[Stephane Ducasse]

#(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?