"r0": 437.6000000000001,
              "a1": 620.25,
              "r1": 581.4666666666667,
              "depth": 3,
              "children": 0
            },
            {
              "args": [
                {
                  "coins-inserted": ["quarter", "dime", "nickel", "penny"],
                  "coins-returned": [],
                  "dispensed": null,
                  "inventory": { "a1": { "name": "taco", "qty": 10, "price": 0.85 } },
                  "err-msg": null
                },
  