src/byte2pair.js

const digits = [
	'0',
	'1',
	'2',
	'3',
	'4',
	'5',
	'6',
	'7',
	'8',
	'9',
	'A',
	'B',
	'C',
	'D',
	'E',
	'F',
];

const pair2byte = [];

for (const first of digits) {
	for (const second of digits) {
		pair2byte.push(first + second);
	}
}

export default pair2byte;