True flipper: flippe no flippe = The same number : Not flippers: flippe no flippe = Not the same number :
Mathematics Article that talking about rotator and swims notes = Flipper notes Link: http://bwjm.ca/pub_rotators.php Interesting SWIMS From CoinWeek - Cool Currency Memphis IPMS 2012 Video : Thanks to CoinWeek - Link: http://www.coinweek.com/paper-money-2/paper-money-us/cool-currency-memphis-ipms-2012-video-part-1/