REF: 'a b' TEST: 'a b'
Only in REF:
Not in REF:
----------------------------------------
REF: 'a b' TEST: 'a'
Only in REF: b
Not in REF:
----------------------------------------
REF: 'a b' TEST: 'a b c'
Only in REF:
Not in REF:  c
----------------------------------------
REF: 'a b' TEST: 'b 99 xyz'
Only in REF: a
Not in REF:  99 xyz
----------------------------------------