4 = 4
4 5 = 20
4 5 6 = 120
4*5*6 = 120
{1} = [1]
{1,2} = [1,2]
4{1,2} = [4,8]
4{1,2}5 = [20,40]
{1,2}{3,4} = [3,8]
{1,2}*{3,4} = [3,8]
{1,2}{3,4}5 = [15,40]
{1,2}{3,4}{5,6} = [15,48]
{1,2}x{3,4} = '11'
3{1,2}x{3,4} = '33'
3x5 = Type error
3x{1,2} = Type error
{1,2}x3 = Type error
{1,2}x{3,4,5} = Size error
{1,2}{3,4,5} = Size error
{1,2}x3{4,5} = Type error
{1,2}x(3{4,5}) = '42'