Why am I getting the same output from different codes? - database

Question

So, I've been learning MDX and I came across some basic data querying along multiple dimensions.
The concept of tuples and sets are kind of clear for me.
What's the query supposed to do: show a measure across multiple dimensions
Code 1:
Select
Non Empty
{[Measures].[name of measure]}
On Columns,
Non Empty
{
(
[Table 0].[Hierarchy 0].&[Member 0] *
[Table 1].[Hierarchy 1].Children *
[Table 2].[Hierarchy 2].Children *
[Table 2].[Hierarchy 3].Children *
{ [Table 3].[Hierarchy 4].&[Member 1],
[Table 3].[Hierarchy 4].&[Member 2],
[Table 3].[Hierarchy 4].&[Member 3],
[Table 3].[Hierarchy 4].&[Member 4],
[Table 3].[Hierarchy 4].&[Member 5]
}
)
}
On Rows
From [DB]
Description: On columns, there's a set followed by a big tuple with multiple cross joins. I explicitly select some members in order to filter them.
Code 2:
Select
Non Empty
{[Measures].[name of measure]}
On Columns,
Non Empty
(
{[Table 0].[Hierarchy 0].&[Member 0]} *
( { [Table 1].[Hierarchy 1].Children } *
( { [Table 2].[Hierarchy 2].Children } *
( { [Table 2].[Hierarchy 3].Children } *
{[Table 3].[Hierarchy 4].&[Member 1],
[Table 3].[Hierarchy 4].&[Member 2],
[Table 3].[Hierarchy 4].&[Member 3],
[Table 3].[Hierarchy 4].&[Member 4],
[Table 3].[Hierarchy 4].&[Member 5]}
)
)
)
)
On Rows
From [DB]
Description: Nested tuples and sets.
I've got the first code from my mind and the 2nd one from a query generator. They both give me the same output, but I can't get my head wrapped around the concept on the 2nd one. Why are there so many tuples and sets?
Which would be the optimal version?