v = array1d(1..3 ,[3, 2, 1]);
----------
v = array1d(1..3 ,[2, 3, 1]);
----------
v = array1d(1..3 ,[3, 1, 2]);
----------
v = array1d(1..3 ,[1, 3, 2]);
----------
v = array1d(1..3 ,[2, 1, 3]);
----------
v = array1d(1..3 ,[1, 2, 3]);
----------
==========