Players select one number from 1 to 31 from each of two columns for a two-digit combination. https://funnie.us/%eb%a1%9c%eb%98%90%ec%a0%84%eb%ac%b8%ea%b0%80%eb%b6%84%ec%84%9d-%eb%8b%b9%ec%b2%a8-%ed%99%95%eb%a5%a0%ec%9d%84-%eb%86%92%ec%9d%b4%eb%8a%94-%ec%a7%80%ed%98%9c/
