CoalBuyer:
  type: interact
  steps:
    'Starting*':
      click trigger:
        script:
        - chat "Hey, do you have any coal to sell? I pay 2 dollar for three coal pieces."
        - narrate "Type yes if you want to sell some coal."
      chat trigger:
         'yes':
           trigger: "/Yes/. You can have three pieces of coal."
           script:
           - if <player.inventory.contains[i@COAL].quantity[3]> {
             - chat "Thank you so much!"
             - take i@coal quantity:3
             - money give quantity:2 
             } else {
             - chat "That is not coal. What trick are you trying to play on me? Bye."
             }
         'no':
           trigger: "No."
           script:
           - chat "ok."