How can I generate such a hierarchical tree of data?

There are 3 columns to be generated X, Y and Z.
For each value of X, we can have from 1 to 50 (randomly decide) values of Y.
For each value of Y, we can have from 1 to 50 (randomly decide) values of Z.
X..............     Y..............Z
======     ======     ======
1..............     1..............     1
1..............     1..............     2
1..............     1..............     3
1..............     1..............     4
1..............     2..............     1
1..............     2..............     2
1..............     3..............     1
2..............     1..............     1
2..............     1..............     2
2..............     2..............     1
2..............     2..............     2
2..............     2..............     3
2..............     2..............     4
2..............     2..............     5
2..............     2..............     6
2..............     3..............     1
2..............     3..............     2
2..............     3..............     3
2..............     3..............     4
2..............     4..............     1
2..............     4..............     2
2..............     5..............     1
2..............     5..............     2
2..............     5..............     3
2..............     5..............     4
2..............     5..............     5
3..............     1..............     1
4..............     1..............     1
4..............     1..............     2
4..............     2..............     1
4..............     2..............     2
4..............     2..............     3
The total number of rows to be generated should be fixed say for example, 250,000
Can I write a single query to generate such a hierarchy?

X Y Z
1     1     1
1     1     2
1     1     3
1     2     1
1     2     2
1     2     3
1     3     1
1     3     2
1     3     3
2     1     1
2     1     2
2     1     3
2     2     1
2     2     2
2     2     3
2     3     1
2     3     2
2     3     3
3     1     1
3     1     2
3     1     3
3     2     1
3     2     2
3     2     3
3     3     1
3     3     2
3     3     3
4     1     1
4     1     2
4     1     3
4     2     1
4     2     2
4     2     3
4     3     1
4     3     2
4     3     3
5     1     1
5     1     2
5     1     3
5     2     1
5     2     2
5     2     3
5     3     1
5     3     2
5     3     3
6     1     1
6     1     2
6     1     3
6     2     1
6     2     2
6     2     3
6     3     1
6     3     2
6     3     3
7     1     1
7     1     2
7     1     3
7     2     1
7     2     2
7     2     3
7     3     1
7     3     2
7     3     3
8     1     1
8     1     2
8     1     3
8     2     1
8     2     2
8     2     3
8     3     1
8     3     2
8     3     3
9     1     1
9     1     2
9     1     3
9     2     1
9     2     2
9     2     3
9     3     1
9     3     2
9     3     3
Your query would give the output like above.If you look at the data. We have X from 1, 2, 3, ...9. For each of the X values, we have Y values 1,2,3.
**(This has become fix. You have values 1,2 & 3 for each X value. This should be varied. eg. for X=1, we can have Y=1,2; for X=2 we can have Y = 1,2,3,4; for X=3 we can have Y =1)
And for each Y values, we have Z values 1,2,3.
**(This has become fix. You have values 1,2 & 3 for each Y value. This should be varied. eg. for X= & Y=1, we can have Z=1,2,3,4,5,6,7; for X=1 & Y=2 we can have Z = 1,2,3; for X=2 & Y=1 we can have Z =1)
The only things is the upper limit is 50.

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