my @D = (0, 1, 2, 3, 4, 5, 6, 7, 8, 9);
my @E = qq(a b c d e f g h i j k l m n o p q r s t u v w x y z);
my @F = (1, 3, 5, 7, 9);
my @G = qq(a b c d e f g h i j k l m);
my @H = (2, 4, 6, 8);
my @K = qq(n o p q r s t u v w x y z);
my @M = (0, 1, 2, 3, 4, 5, 6, 7, 8, 9);
my @P = qq(a b c d e f g h i j k l m n o p q r s t u v w x y z);
my @S = (1, 3, 5, 7, 9);
my @T = qq(a b c d e f g h i j k l m);
my @x = (2, 4, 6, 8);
my @Z = qq(n o p q r s t u v w x y z);