"application/vnd.sealed.tiff",
				"application/vnd.sealed.xls",
				"application/vnd.sealedmedia.softseal.html",
				"application/vnd.sealedmedia.softseal.pdf",
				"application/vnd.seemail",
				"application/vnd.sema",
				"application/vnd.semd",
				"application/vnd.semf",
				"application/vnd.shana.informed.formdata",
				"application/vnd.shana.informed.formtemplate",
				"application/vnd.shana.informed.interchange",

		}
	}
}

func tenRunes(r rune) string {
	runes := make([]rune, 10)
	for i := range runes {
		runes[i] = r
	}
	return string(runes)
}

// User-defined self-inverse mapping function
func rot13(r rune) rune {
	const step = 13
	if r >= 'a' && r <= 'z' {
		return ((r - 'a' + step) % 26) + 'a'
	}
	if r >= 'A' && r <= 'Z' {
		return ((r - 'A' + step) % 26) + 'A'