create_problem = function()
	local s = Solution
	Problem = {
		row_totals = {s.row_totals[1], s.row_totals[2]},
		col_totals = {s.col_totals[1], s.col_totals[2]},
		data = {
			{'', ''},
			{'', ''},
		},
	}
	local x = math.random(1, 2)
	local y = math.random(1, 2)
	Problem.data[y][x] = s.data[y][x]
	Problem.x, Problem.y = x, y
end