const (
	// Numeric includes decimal numbers (0-9)
	Numeric = "0123456789"

	// Upper is uppercase characters in the Latin alphabet
	Upper = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

	// Lower is lowercase characters in the Latin alphabet
	Lower = "abcdefghijklmnopqrstuvwxyz"

	// Alpha is upper or lowercase alphabetic characters
	Alpha = Upper + Lower

	// Default is uppercase, lowercase, or numeric characters
	Default = Numeric + Alpha

	// Hex is hexadecimal lowercase characters
	Hex = "0123456789abcdef"

	// Human creates strings which are easily distinguishable from
	// others created with the same charset. It contains most lowercase
	// alphanumeric characters without 0,o,i,1,l.
	Human = "23456789abcdefghjkmnpqrstuvwxyz"
)