The fast that is intended for its own sake includes the Ramadan fast, making up missed Ramadan fasts, fasting in fulfilment of a vow, and fasting on special days, such as the days of `Arafah and `Ashura’, and fasting on Mondays. With regard to that which is not intended for its own sake, this refers to cases where the aim is to observe a type of recommended fast, without needing to observe the fast on any particular day, such as fasting three days of every month. In that case, it is permissible to form the intention that you want to combine fasting the day of `Arafah or fasting on a Monday with fasting one of the three days of every month.