one is 'I am one'
two is 'I am two'
-------------
##swap2_1: I am two
##swap2_1: I am one
-------------
##swap2_2: I am two
##swap2_2: I am one
-------------
one is 'I am one'
two is 'I am two'
-------------
one is 'AAA'
two is 'BBB'
-------------