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                  "stateVariable": false,
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                    "typeString": "uint256"
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                  "typeName": {
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                      "typeString": "uint256"
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            "src": "912:68:47",
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              "src": "835:72:47",
              "text": " @dev Returns the amount of tokens owned by `account`."
            },
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                  "src": "931:15:47",
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                  "typeDescriptions": {
                    "typeIdentifier": "t_address",
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                  },
                  "typeName": {
                    "id": 33352,
                    "name": "address",
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                      "typeIdentifier": "t_address",
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            "returnParameters": {
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                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
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                  },
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            "nodes": [],
            "documentation": {
              "id": 33359,
              "nodeType": "StructuredDocumentation",
              "src": "986:202:47",
              "text": " @dev Moves `amount` tokens from the caller's account to `to`.\n Returns a boolean value indicating whether the operation succeeded.\n Emits a {Transfer} event."
            },
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                  "scope": 33368,
                  "src": "1211:10:47",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_address",
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                  },
                  "typeName": {
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                      "typeIdentifier": "t_address",
                      "typeString": "address"
                    }
                  },
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                },
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                  "name": "amount",
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                  "src": "1223:14:47",
                  "stateVariable": false,
                  "storageLocation": "default",
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                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 33362,
                    "name": "uint256",
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                    "src": "1223:7:47",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
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                }
              ],
              "src": "1210:28:47"
            },
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                    "src": "1257:4:47",
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            },
            "scope": 33401,
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            "visibility": "external"
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            "nodes": [],
            "documentation": {
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              "nodeType": "StructuredDocumentation",
              "src": "1269:264:47",
              "text": " @dev Returns the remaining number of tokens that `spender` will be\n allowed to spend on behalf of `owner` through {transferFrom}. This is\n zero by default.\n This value changes when {approve} or {transferFrom} are called."
            },
            "functionSelector": "dd62ed3e",
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              "nodeType": "ParameterList",
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                  "src": "1557:13:47",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_address",
                    "typeString": "address"
                  },
                  "typeName": {
                    "id": 33370,
                    "name": "address",
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                    "src": "1557:7:47",
                    "stateMutability": "nonpayable",
                    "typeDescriptions": {
                      "typeIdentifier": "t_address",
                      "typeString": "address"
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                  "src": "1572:15:47",
                  "stateVariable": false,
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                    "typeIdentifier": "t_address",
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                  "typeName": {
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                    "src": "1572:7:47",
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                      "typeIdentifier": "t_address",
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                  },
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                }
              ],
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            "returnParameters": {
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                  "mutability": "mutable",
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                  "nameLocation": "-1:-1:-1",
                  "nodeType": "VariableDeclaration",
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                  "src": "1612:7:47",
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                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 33375,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "1612:7:47",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "visibility": "internal"
                }
              ],
              "src": "1611:9:47"
            },
            "scope": 33401,
            "stateMutability": "view",
            "virtual": false,
            "visibility": "external"
          },
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            "id": 33388,
            "nodeType": "FunctionDefinition",
            "src": "2274:74:47",
            "nodes": [],
            "documentation": {
              "id": 33379,
              "nodeType": "StructuredDocumentation",
              "src": "1627:642:47",
              "text": " @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\n Returns a boolean value indicating whether the operation succeeded.\n IMPORTANT: Beware that changing an allowance with this method brings the risk\n that someone may use both the old and the new allowance by unfortunate\n transaction ordering. One possible solution to mitigate this race\n condition is to first reduce the spender's allowance to 0 and set the\n desired value afterwards:\n https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n Emits an {Approval} event."
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              "parameters": [
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                  "constant": false,
                  "id": 33381,
                  "mutability": "mutable",
                  "name": "spender",
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                  "scope": 33388,
                  "src": "2291:15:47",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_address",
                    "typeString": "address"
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                  "typeName": {
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                    "name": "address",
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                    "src": "2291:7:47",
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                      "typeIdentifier": "t_address",
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                      "typeIdentifier": "t_uint256",
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              "nodeType": "StructuredDocumentation",
              "src": "2354:287:47",
              "text": " @dev Moves `amount` tokens from `from` to `to` using the\n allowance mechanism. `amount` is then deducted from the caller's\n allowance.\n Returns a boolean value indicating whether the operation succeeded.\n Emits a {Transfer} event."
            },
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                  "src": "2677:12:47",
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                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_address",
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                    "name": "address",
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                    "typeDescriptions": {
                      "typeIdentifier": "t_address",
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                  "src": "2699:10:47",
                  "stateVariable": false,
                  "storageLocation": "default",
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                    "src": "2699:7:47",
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                      "typeIdentifier": "t_address",
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                  },
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                  "src": "2719:14:47",
                  "stateVariable": false,
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                    "typeIdentifier": "t_uint256",
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                  "typeName": {
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                    "name": "uint256",
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                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
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                  },
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              ],
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        "baseContracts": [],
        "canonicalName": "IERC20",
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          "src": "131:70:47",
          "text": " @dev Interface of the ERC20 standard as defined in the EIP."
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        "fullyImplemented": false,
        "linearizedBaseContracts": [
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        "name": "IERC20",
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    "license": "MIT"
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}