# OPERATIONS
Class:
- Constants
- Subsession(BaseSubsession)
- Group(BaseGroup)
- Player(BasePlayer)
- Transaction(ExtraModel)

Function:
- creating_session(subsession: Subsession)
- find_match(buyer: Player, seller: Player)
- live_method(player: Player, data)

# DISPLAY
Class:
- Introduction(Page)
- WaitToStart(WaitPage)
- Trading(Page)
- ResultsWaitPage(WaitPage)
- Results(Page)

Variable:
- page_sequence = [Introduction, WaitToStart, Trading, ResultsWaitPage, Results]