UNORDERED(before):
 foo  1  zot
 foo  2  blahblah
 bar  1  zot
 bar  2  zot
 bat  1  blahblah
 bat  2
 baz  1
 baz  2  zot

ORDERED(after):
 foo  2  blahblah
 bat  1  blahblah
 foo  1  zot
 bar  1  zot
 bar  2  zot
 bat  2
 baz  1
 baz  2  zot