switch reg[2] {
	case 0:
		return altRegionISO3[reg[3]:][:3]
	case ' ':
		return "ZZZ"
	}
	return reg[0:1] + reg[2:4]
}

// M49 returns the UN M.49 encoding of r, or 0 if this encoding
// is not defined for r.
func (r Region) M49() int {
	return int(m49[r])
}

// IsPrivateUse reports whether r has the ISO 3166 User-assigned status. This

// In such cases this method returns "ZZZ".
func (r Region) ISO3() string {
	return r.regionID.ISO3()
}

// M49 returns the UN M.49 encoding of r, or 0 if this encoding
// is not defined for r.
func (r Region) M49() int {
	return r.regionID.M49()
}

// IsPrivateUse reports whether r has the ISO 3166 User-assigned status. This

	17: {From: 0x142, To: 0x134},
	18: {From: 0x15e, To: 0x15f},
	19: {From: 0x164, To: 0x4b},
}

// m49 maps regionIDs to UN.M49 codes. The first isoRegionOffset entries are
// codes indicating collections of regions.
// Size: 718 bytes, 359 elements
var m49 = [359]int16{
	// Entry 0 - 3F
	0, 1, 2, 3, 5, 9, 11, 13,
	14, 15, 17, 18, 19, 21, 29, 30,
	34, 35, 39, 53, 54, 57, 61, 142,