func IsLower(s string) bool {
	return IsAlpha(s) && s == strings.ToLower(s)
}
func IsLower(s string) bool {
	return IsAlpha(s) && s == strings.ToLower(s)
}
func IsLower ( s string ) bool { return IsAlpha ( s ) && s == strings . ToLower ( s ) }
// IsLower returns true if s comprised of all lower case characters.
IsLower returns true if s comprised of all lower case characters .