xyzz => z = 0,2,4,6,8
=> x + y = 8 => x = 1,2,3,4,5,6,7,8
y = 7,6,5,4,3,2,1,0
xyzz = 1700,2600,3500,4400,5300,6200,7100,8000
1722,2622,3522,4422,5322,6222,7122,8022
1744,2644,3544,4444,5344,6244,7144,8044
1766,2666,3566,4466,5366,6266,7166,8066
1788,2688,3588,4488,5388,6288,7188,8088