xaxb = [
[ '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0'],
[ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', '10'],
[ '0', '2', '4', '6', '8', 'a', 'c', 'e', '10', '12', '14', '16', '18', '1a', '1c', '1e', '20'],
[ '0', '3', '6', '9', 'c', 'f', '12', '15', '18', '1b', '1e', '21', '24', '27', '2a', '2d', '30'],
[ '0', '4', '8', 'c', '10', '14', '18', '1c', '20', '24', '28', '2c', '30', '34', '38', '3c', '40'],
[ '0', '5', 'a', 'f', '14', '19', '1e', '23', '28', '2d', '32', '37', '3c', '41', '46', '4b', '50'],
[ '0', '6', 'c', '12', '18', '1e', '24', '2a', '30', '36', '3c', '42', '48', '4e', '54', '5a', '60'],
[ '0', '7', 'e', '15', '1c', '23', '2a', '31', '38', '3f', '46', '4d', '54', '5b', '62', '69', '70'],
[ '0', '8', '10', '18', '20', '28', '30', '38', '40', '48', '50', '58', '60', '68', '70', '78', '80'],
[ '0', '9', '12', '1b', '24', '2d', '36', '3f', '48', '51', '5a', '63', '6c', '75', '7e', '87', '90'],
[ '0', 'a', '14', '1e', '28', '32', '3c', '46', '50', '5a', '64', '6e', '78', '82', '8c', '96', 'a0'],
[ '0', 'b', '16', '21', '2c', '37', '42', '4d', '58', '63', '6e', '79', '84', '8f', '9a', 'a5', 'b0'],
[ '0', 'c', '18', '24', '30', '3c', '48', '54', '60', '6c', '78', '84', '90', '9c', 'a8', 'b4', 'c0'],
[ '0', 'd', '1a', '27', '34', '41', '4e', '5b', '68', '75', '82', '8f', '9c', 'a9', 'b6', 'c3', 'd0'],
[ '0', 'e', '1c', '2a', '38', '46', '54', '62', '70', '7e', '8c', '9a', 'a8', 'b6', 'c4', 'd2', 'e0'],
[ '0', 'f', '1e', '2d', '3c', '4b', '5a', '69', '78', '87', '96', 'a5', 'b4', 'c3', 'd2', 'e1', 'f0'],
[ '0', '10', '20', '30', '40', '50', '60', '70', '80', '90', 'a0', 'b0', 'c0', 'd0', 'e0', 'f0', '100']]