===== PascalABC.NET =====
begin
var a := MatrRandom(3, 7, -99, 99);
a.Println(4);
Writeln;
var i := Range(0, 6).ToArray;
a := a.MatrSlice(Arr(0,1,2), i[:4] + i[5:]);
a.Println(4)
end.
