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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const gasStation = Machine({
  id: "dynamic",
  initial: "prerequisites",
  states: {
    prerequisites: {
      type: "parallel",
      onDone: "pump",
      states: {
        prepayment: {
          initial: "needed",
          states: {
            needed: {
              on: {
                PRE_PAY: "processing"
              }
            },
            processing: {
              on: {
                PAYMENT_SUCCESS: "done",
                PAYMENT_ACCEPTED: "needed"
              }
            },
            done: {
              type: "final"
            }
          }
        },
        grade: {
          initial: "needed",
          states: {
            needed: {
              on: {
                SELECT_GRADE: "done"
              }
            },
            done: {
              type: "final"
            }
          }
        }
      }
    },
    pump: {
      on: {
        PUMP_GAS: "done"
      }
    },
    done: {
      on: {
        RESET: "prerequisites"
      }
    }
  }
});