# call as mu ( $start, $targer, $max );
mu( "MUUUU", "M", 20 );   # returns 2 UPDATED!!!!!! (thanks japhy)
mu( "MI", "MU", 20 );     # returns 0
mu( "MI", "MI", 20 );     # returns 0
mu( "MI", "MUIUI", 20);   # returns 4
mu( "MI", "MUIUI", 3 );   # returns 0