 Complete the following phrase:  During the season, which runs from August to May, each club plays each of the other teams twice; once at home and once away, totalling 38 games for each team by the end of the season. Thus, in Italian football a true round-robin format is used. In the first half of the season, called the andata, each team plays once against each league opponent, for a total of 19 games. In the second half of the season, called the ritorno, the teams play another 19 games, once more against each opponent, in which home and away matches are reversed. The two halves of the season had exactly the same order of fixtures until the 202122 season, when an asymmetrical calendar was introduced, following the format of the English, Spanish, and French leagues. Since the 