Help with multiple key sort

[ian.brady1 at gmail.com]

gurus:

I want to implement a sql-like sort-by on multiple keys.  I've seen
many examples of just two keys.

I have a list like this

1 one 2
1 one 1
1 two 1
1 one 0
1 xx   0

result should be like this

1 four 2
1 one 0
1 one 1
1 one 2
1 xx   0

It moves right while keeping sorted order to the left.  This is the
new stable sort in 2.5.

I'm not sure what I'm doing wrong.  please help.

Thanks