func exp2(e uint8) int64 {
	if e == 0 {
		return 1
	}
	b := int64(2)
	for i := uint8(1); i < e; i++ {
		b *= 2
	}
	return b
}
// exp2 returns the e-th power of 2
exp2 returns the e-th power of 2
// exp2 returns the e - th power of 2
func exp2(e uint8) int64 {
	if e == 0 {
		return 1
	}
	b := int64(2)
	for i := uint8(1); i < e; i++ {
		b *= 2
	}
	return b
}
func exp2 ( e uint8 ) int64 { if e == 0 { return 1 } b := int64 ( 2 ) for i := uint8 ( 1 ) ; i < e ; i ++ { b *= 2 } return b }
exp2 returns the e-th power of 2
exp2 returns the e - th power of 2