Context: The Arena Football League briefly had a two-game exhibition season in the early 2000s, a practice that ended in 2003 with a new television contract. Exhibition games outside of a structured season are relatively common among indoor American football leagues; because teams switch leagues frequently at that level of play, it is not uncommon to see some of the smaller leagues schedule exhibition games against teams that are from another league, about to join the league as a probational franchise, or a semi-pro outdoor team to fill holes in a schedule.

Question: How many exhibition games did the Arena Football League have per year in the early 2000s?
Answer: two

Question: What type of league commonly plays unstructured exhibition games?
Answer: indoor American football leagues

Question: What is a team called that is in the process of joining a league?
Answer: a probational franchise

Question: Indoor league teams sometimes play against what type of outdoor league team?
Answer: semi-pro

Question: Who had two-game exhibition seasons in the late 2000's
Answer: Unanswerable

Question: What started this practice in 2003?
Answer: Unanswerable

Question: What is relatively uncommon among indoor American football leagues?
Answer: Unanswerable

Question: What is it uncommon for small leagues to join other leagues as?
Answer: Unanswerable

Question: At what level do teams not switch leagues frequently occur in a walk
Answer: Unanswerable