x:= [1,2,3,om,om,om];
x;
   x:= [om,om,om,om];
x;
   x:= [om,1,om,2,om,3];
x;
   x:= [om,1,om,2,om,3,om];
x;

   [x,y,~,z] := om;
x;y;z;

   [x,y,~,z] := [1,2,3,4];
x;y;z;

   [x,y,~,z] := [11,12,13,14,15,16,17];
x;y;z;

   [x,y,~,z] := [21,22];
x;y;z;

[1,1..10];
[10,10..1];