diff --git a/.eslintignore b/.eslintignore
index dc142da..bf2f493 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -13,6 +13,11 @@ artifacts
 cache
 typechain-types
 
+# foundry
+cache_forge
+out
+docs
+
 # production
 dist
 build
diff --git a/.github/workflows/pull-requests.yml b/.github/workflows/pull-requests.yml
index d41300e..5179e62 100644
--- a/.github/workflows/pull-requests.yml
+++ b/.github/workflows/pull-requests.yml
@@ -16,6 +16,9 @@ jobs:
                   node-version: 20
                   cache: yarn
 
+            - name: "Install Foundry"
+              uses: "foundry-rs/foundry-toolchain@v1"
+
             - name: Install dependencies
               run: yarn
 
@@ -69,6 +72,9 @@ jobs:
                   node-version: 20
                   cache: yarn
 
+            - name: "Install Foundry"
+              uses: "foundry-rs/foundry-toolchain@v1"
+
             - name: Install dependencies
               run: yarn
 
diff --git a/.prettierignore b/.prettierignore
index a919fdc..5a11770 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -13,6 +13,11 @@ artifacts
 cache
 typechain-types
 
+# foundry
+cache_forge
+out
+docs
+
 # production
 dist
 build
diff --git a/.prettierrc.json b/.prettierrc.json
index 27140f2..717fb52 100644
--- a/.prettierrc.json
+++ b/.prettierrc.json
@@ -1,5 +1,6 @@
 {
     "semi": false,
     "arrowParens": "always",
-    "trailingComma": "none"
+    "trailingComma": "none",
+    "plugins": ["prettier-plugin-solidity"]
 }
diff --git a/apps/docs/package.json b/apps/docs/package.json
index e9ec979..b9b7464 100644
--- a/apps/docs/package.json
+++ b/apps/docs/package.json
@@ -37,7 +37,7 @@
         "remark-mdx": "^3.0.1",
         "remark-preset-lint-consistent": "^6.0.0",
         "remark-preset-lint-recommended": "^7.0.0",
-        "typescript": "~5.5.0"
+        "typescript": "5.3"
     },
     "browserslist": {
         "production": [
diff --git a/apps/website/package.json b/apps/website/package.json
index 13e1c05..d186839 100644
--- a/apps/website/package.json
+++ b/apps/website/package.json
@@ -8,7 +8,7 @@
         "preview": "vite preview"
     },
     "devDependencies": {
-        "typescript": "^5.5.0",
+        "typescript": "5.3",
         "vite": "^5.4.1"
     }
 }
diff --git a/package.json b/package.json
index 968deaa..125c4be 100644
--- a/package.json
+++ b/package.json
@@ -16,8 +16,8 @@
         "@commitlint/cli": "^19.5.0",
         "@commitlint/config-conventional": "^19.5.0",
         "@types/node": "^22.5.5",
-        "@typescript-eslint/eslint-plugin": "^7.0.2",
-        "@typescript-eslint/parser": "^7.0.2",
+        "@typescript-eslint/eslint-plugin": "^6.0.0",
+        "@typescript-eslint/parser": "^6.0.0",
         "changelogithub": "^0.13.10",
         "czg": "^1.9.4",
         "eslint": "^8.56.0",
@@ -31,9 +31,10 @@
         "husky": "^9.1.6",
         "lint-staged": "^15.2.10",
         "prettier": "^3.3.3",
+        "prettier-plugin-solidity": "^1.4.1",
         "rimraf": "^6.0.1",
         "ts-node": "^10.9.2",
-        "typescript": "^5.5.0"
+        "typescript": "5.3"
     },
     "scripts": {
         "build": "yarn build:docs && yarn build:website && yarn build:packages",
@@ -45,14 +46,14 @@
         "test:coverage": "yarn test:contracts-coverage",
         "test:contracts": "yarn workspace excubiae-contracts test",
         "test:contracts-coverage": "yarn workspace excubiae-contracts test:coverage",
-        "format": "prettier -c . && yarn workspace excubiae-docs format",
-        "format:write": "prettier -w . && yarn workspace excubiae-docs format:write",
+        "format": "prettier -c . && yarn workspace excubiae-docs format && yarn workspace excubiae-contracts format:forge",
+        "format:write": "prettier -w . && yarn workspace excubiae-docs format:write && yarn workspace excubiae-contracts format:forge && yarn workspace excubiae-docs format",
         "lint": "eslint . && yarn workspace excubiae-contracts lint",
         "lint:fix": "eslint . --fix && yarn workspace excubiae-contracts lint:fix",
         "version:bump": "scripts/version.ts ${0}",
         "version:publish": "scripts/publish.ts",
         "version:release": "changelogithub",
-        "clean": "scripts/clean-apps.ts && scripts/clean-packages.ts && rimraf node_modules",
+        "clean": "scripts/clean-apps.ts && scripts/clean-packages.ts && rimraf node_modules coverage",
         "remove:stable-version-field": "scripts/remove-stable-version-field.ts && yarn format:write",
         "precommit": "lint-staged",
         "postinstall": "husky && git config --local core.editor cat"
diff --git a/packages/contracts/.gitignore b/packages/contracts/.gitignore
index e8c12ff..50a694e 100644
--- a/packages/contracts/.gitignore
+++ b/packages/contracts/.gitignore
@@ -5,6 +5,11 @@ node_modules
 /cache
 /artifacts
 
+# Forge files
+/out
+/cache_forge
+/docs
+
 # TypeChain files
 /typechain
 /typechain-types
diff --git a/packages/contracts/.prettierrc.json b/packages/contracts/.prettierrc.json
deleted file mode 100644
index 717fb52..0000000
--- a/packages/contracts/.prettierrc.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-    "semi": false,
-    "arrowParens": "always",
-    "trailingComma": "none",
-    "plugins": ["prettier-plugin-solidity"]
-}
diff --git a/packages/contracts/.solhint.json b/packages/contracts/.solhint.json
index 5abdd3c..27252e4 100644
--- a/packages/contracts/.solhint.json
+++ b/packages/contracts/.solhint.json
@@ -1,6 +1,5 @@
 {
     "extends": "solhint:recommended",
-    "plugins": ["prettier"],
     "rules": {
         "code-complexity": ["error", 7],
         "compiler-version": ["error", ">=0.8.0"],
@@ -11,12 +10,6 @@
         "func-visibility": ["error", { "ignoreConstructors": true }],
         "max-line-length": ["error", 120],
         "not-rely-on-time": "off",
-        "prettier/prettier": [
-            "error",
-            {
-                "endOfLine": "auto"
-            }
-        ],
         "reason-string": ["warn", { "maxLength": 80 }]
     }
 }
diff --git a/packages/contracts/.solhintignore b/packages/contracts/.solhintignore
new file mode 100644
index 0000000..d0089ea
--- /dev/null
+++ b/packages/contracts/.solhintignore
@@ -0,0 +1 @@
+contracts/node_modules
\ No newline at end of file
diff --git a/packages/contracts/contracts/package.json b/packages/contracts/contracts/package.json
index 1d9e376..56c069c 100644
--- a/packages/contracts/contracts/package.json
+++ b/packages/contracts/contracts/package.json
@@ -23,5 +23,8 @@
     "publishConfig": {
         "access": "public"
     },
-    "packageManager": "yarn@4.5.0"
+    "packageManager": "yarn@4.5.0",
+    "dependencies": {
+        "@openzeppelin/contracts": "^5.0.2"
+    }
 }
diff --git a/packages/contracts/contracts/Lock.sol b/packages/contracts/contracts/src/Lock.sol
similarity index 76%
rename from packages/contracts/contracts/Lock.sol
rename to packages/contracts/contracts/src/Lock.sol
index 52512f2..ca5c91c 100644
--- a/packages/contracts/contracts/Lock.sol
+++ b/packages/contracts/contracts/src/Lock.sol
@@ -1,12 +1,13 @@
 // SPDX-License-Identifier: UNLICENSED
 pragma solidity ^0.8.27;
 
+import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
+
 // Uncomment this line to use console.log
 // import "hardhat/console.sol";
 
-contract Lock {
+contract Lock is Ownable(msg.sender) {
     uint256 public unlockTime;
-    address payable public owner;
 
     event Withdrawal(uint256 amount, uint256 when);
 
@@ -14,18 +15,15 @@ contract Lock {
         require(block.timestamp < _unlockTime, "Unlock time should be in the future");
 
         unlockTime = _unlockTime;
-        owner = payable(msg.sender);
     }
 
-    function withdraw() public {
+    function withdraw() public onlyOwner {
         // Uncomment this line, and the import of "hardhat/console.sol", to print a log in your terminal
         // console.log("Unlock time is %o and block timestamp is %o", unlockTime, block.timestamp);
-
         require(block.timestamp >= unlockTime, "You can't withdraw yet");
-        require(msg.sender == owner, "You aren't the owner");
 
         emit Withdrawal(address(this).balance, block.timestamp);
 
-        owner.transfer(address(this).balance);
+        payable(owner()).transfer(address(this).balance);
     }
 }
diff --git a/packages/contracts/contracts/test/Lock.t.sol b/packages/contracts/contracts/test/Lock.t.sol
new file mode 100644
index 0000000..ff3fcbd
--- /dev/null
+++ b/packages/contracts/contracts/test/Lock.t.sol
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity >=0.8.25 <0.9.0;
+
+import {Test} from "forge-std/src/Test.sol";
+import {console2} from "forge-std/src/console2.sol";
+
+import {Lock} from "../src/Lock.sol";
+
+contract LockTest is Test {
+    Lock internal lock;
+
+    function setUp() public virtual {
+        // Set unlock time to 1 hour from now
+        lock = new Lock{value: 1 ether}(block.timestamp + 1 hours);
+    }
+
+    function test_CannotWithdrawYet() external {
+        // Attempt to withdraw before unlock time
+        vm.expectRevert("You can't withdraw yet");
+        lock.withdraw();
+    }
+}
diff --git a/packages/contracts/foundry.toml b/packages/contracts/foundry.toml
new file mode 100644
index 0000000..0d5e169
--- /dev/null
+++ b/packages/contracts/foundry.toml
@@ -0,0 +1,6 @@
+[profile.default]
+src = 'contracts/src'
+out = 'out'
+libs = ['node_modules']
+test = 'contracts/test'
+cache_path  = 'cache_forge'
\ No newline at end of file
diff --git a/packages/contracts/hardhat.config.ts b/packages/contracts/hardhat.config.ts
index 1007685..fc92787 100644
--- a/packages/contracts/hardhat.config.ts
+++ b/packages/contracts/hardhat.config.ts
@@ -1,8 +1,15 @@
 import { HardhatUserConfig } from "hardhat/config"
 import "@nomicfoundation/hardhat-toolbox"
+import "@nomicfoundation/hardhat-foundry"
 
 const config: HardhatUserConfig = {
-    solidity: "0.8.27"
+    solidity: "0.8.27",
+    paths: {
+        sources: "./contracts/src",
+        tests: "./test",
+        cache: "./cache",
+        artifacts: "./artifacts"
+    }
 }
 
 export default config
diff --git a/packages/contracts/package.json b/packages/contracts/package.json
index e298a1a..bbc9588 100644
--- a/packages/contracts/package.json
+++ b/packages/contracts/package.json
@@ -1,20 +1,30 @@
 {
     "name": "excubiae-contracts",
-    "packageManager": "yarn@4.5.0",
+    "private": true,
+    "installConfig": {
+        "hoistingLimits": "dependencies"
+    },
     "scripts": {
-        "start": "hardhat node",
-        "compile": "hardhat compile",
+        "start:hardhat": "hardhat node",
+        "start:anvil": "anvil",
+        "compile": "yarn compile:hardhat && yarn compile:forge",
+        "compile:hardhat": "hardhat compile",
+        "compile:forge": "forge compile",
         "deploy": "hardhat deploy",
-        "test": "hardhat test",
-        "test:report-gas": "REPORT_GAS=true hardhat test",
-        "test:coverage": "hardhat coverage",
+        "test": "yarn test:hardhat && yarn test:forge",
+        "test:hardhat": "hardhat test",
+        "test:forge": "forge test",
+        "test:report-gas": "REPORT_GAS=true yarn test && forge test --gas-report",
+        "test:coverage": "hardhat coverage && forge coverage",
         "typechain": "hardhat typechain",
+        "format:forge": "forge fmt",
         "lint": "solhint 'contracts/**/*.sol'",
         "lint:fix": "solhint 'contracts/**/*.sol' --fix --noPrompt"
     },
     "devDependencies": {
         "@nomicfoundation/hardhat-chai-matchers": "^2.0.0",
         "@nomicfoundation/hardhat-ethers": "^3.0.0",
+        "@nomicfoundation/hardhat-foundry": "^1.1.2",
         "@nomicfoundation/hardhat-ignition": "^0.15.5",
         "@nomicfoundation/hardhat-ignition-ethers": "^0.15.0",
         "@nomicfoundation/hardhat-network-helpers": "^1.0.0",
@@ -25,16 +35,19 @@
         "@typechain/hardhat": "^9.0.0",
         "@types/chai": "^4.2.0",
         "@types/mocha": ">=9.1.0",
+        "@types/node": "^22.6.1",
         "chai": "^4.2.0",
         "ethers": "^6.4.0",
+        "forge-std": "github:foundry-rs/forge-std#v1.9.2",
         "hardhat": "^2.22.11",
         "hardhat-gas-reporter": "^1.0.8",
-        "prettier-plugin-solidity": "^1.4.1",
         "solhint": "^5.0.3",
-        "solhint-plugin-prettier": "^0.1.0",
         "solidity-coverage": "^0.8.1",
         "ts-node": "^10.9.2",
         "typechain": "^8.3.0",
-        "typescript": "^5.5.0"
+        "typescript": "5.3"
+    },
+    "dependencies": {
+        "@openzeppelin/contracts": "^5.0.2"
     }
 }
diff --git a/packages/contracts/remappings.txt b/packages/contracts/remappings.txt
new file mode 100644
index 0000000..b0866a6
--- /dev/null
+++ b/packages/contracts/remappings.txt
@@ -0,0 +1,2 @@
+@openzeppelin/=node_modules/@openzeppelin/
+forge-std/=node_modules/forge-std/
diff --git a/packages/contracts/test/Lock.ts b/packages/contracts/test/Lock.ts
index 2e65aa1..61cf3ce 100644
--- a/packages/contracts/test/Lock.ts
+++ b/packages/contracts/test/Lock.ts
@@ -67,7 +67,10 @@ describe("Lock", () => {
                 await time.increaseTo(unlockTime)
 
                 // We use lock.connect() to send a transaction from another account
-                await expect(lock.connect(otherAccount).withdraw()).to.be.revertedWith("You aren't the owner")
+                await expect(lock.connect(otherAccount).withdraw()).to.be.revertedWithCustomError(
+                    lock,
+                    "OwnableUnauthorizedAccount"
+                )
             })
 
             it("Shouldn't fail if the unlockTime has arrived and the owner calls it", async () => {
diff --git a/scripts/clean-packages.ts b/scripts/clean-packages.ts
index caccf8b..c26cad6 100755
--- a/scripts/clean-packages.ts
+++ b/scripts/clean-packages.ts
@@ -3,7 +3,19 @@ import { readdirSync, rmSync } from "fs"
 
 const folderName = "packages"
 
-const gitIgnored = ["node_modules", "dist", "build", "artifacts", "typechain-types", "cache"]
+const gitIgnored = [
+    "node_modules",
+    "dist",
+    "build",
+    "artifacts",
+    "typechain-types",
+    "cache",
+    "cache_forge",
+    "docs",
+    "out",
+    "coverage.json",
+    "lib"
+]
 
 async function main() {
     const folders = readdirSync(folderName, { withFileTypes: true })
diff --git a/scripts/version.ts b/scripts/version.ts
index 12ee259..cd827a9 100755
--- a/scripts/version.ts
+++ b/scripts/version.ts
@@ -10,7 +10,7 @@ async function main() {
     // Apply the versions
     execSync("yarn version apply --all", { stdio: "inherit" })
 
-    await import("./remove-stable-version-field")
+    await import("./remove-stable-version-field.js")
 
     execSync("yarn format:write")
     execSync(`NO_HOOK=1 git commit -am 'chore: v${version}'`)
diff --git a/yarn.lock b/yarn.lock
index 878aa07..e072eb9 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2636,7 +2636,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@eslint-community/regexpp@npm:^4.10.0, @eslint-community/regexpp@npm:^4.6.1":
+"@eslint-community/regexpp@npm:^4.5.1, @eslint-community/regexpp@npm:^4.6.1":
   version: 4.11.1
   resolution: "@eslint-community/regexpp@npm:4.11.1"
   checksum: 10/934b6d3588c7f16b18d41efec4fdb89616c440b7e3256b8cb92cfd31ae12908600f2b986d6c1e61a84cbc10256b1dd3448cd1eec79904bd67ac365d0f1aba2e2
@@ -3105,6 +3105,8 @@ __metadata:
 "@excubiae/contracts@workspace:packages/contracts/contracts":
   version: 0.0.0-use.local
   resolution: "@excubiae/contracts@workspace:packages/contracts/contracts"
+  dependencies:
+    "@openzeppelin/contracts": "npm:^5.0.2"
   languageName: unknown
   linkType: soft
 
@@ -3542,6 +3544,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@nomicfoundation/hardhat-foundry@npm:^1.1.2":
+  version: 1.1.2
+  resolution: "@nomicfoundation/hardhat-foundry@npm:1.1.2"
+  dependencies:
+    chalk: "npm:^2.4.2"
+  peerDependencies:
+    hardhat: ^2.17.2
+  checksum: 10/e722f71167ab62bbe1999ff7398820e1094a802f5240276b7c62450bf24e4e5cee7f45d424746f1cfe66e6637ec1785f640d3049d97544f3baa395380b6ce150
+  languageName: node
+  linkType: hard
+
 "@nomicfoundation/hardhat-ignition-ethers@npm:^0.15.0":
   version: 0.15.5
   resolution: "@nomicfoundation/hardhat-ignition-ethers@npm:0.15.5"
@@ -3829,6 +3842,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@openzeppelin/contracts@npm:^5.0.2":
+  version: 5.0.2
+  resolution: "@openzeppelin/contracts@npm:5.0.2"
+  checksum: 10/938ebffbdade7dc59ea3df5b562c0e457bbefde9d82be8fa2acfd11da887df11653ac07922f41746b80cdbc106430e1e6978ce244fe99b00a7d9dc1418fc7670
+  languageName: node
+  linkType: hard
+
 "@pkgjs/parseargs@npm:^0.11.0":
   version: 0.11.0
   resolution: "@pkgjs/parseargs@npm:0.11.0"
@@ -3870,15 +3890,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@prettier/sync@npm:^0.3.0":
-  version: 0.3.0
-  resolution: "@prettier/sync@npm:0.3.0"
-  peerDependencies:
-    prettier: ^3.0.0
-  checksum: 10/10520d2479830c18256bf2b18349a15a8964f968059f7ccaa1f6d455c133a26e6c96bd7aea7c64ef6701700e8007ad68619b16ec83391b356b5d4a741cbae504
-  languageName: node
-  linkType: hard
-
 "@rollup/rollup-android-arm-eabi@npm:4.22.4":
   version: 4.22.4
   resolution: "@rollup/rollup-android-arm-eabi@npm:4.22.4"
@@ -4710,7 +4721,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/json-schema@npm:^7.0.4, @types/json-schema@npm:^7.0.5, @types/json-schema@npm:^7.0.8, @types/json-schema@npm:^7.0.9":
+"@types/json-schema@npm:^7.0.12, @types/json-schema@npm:^7.0.4, @types/json-schema@npm:^7.0.5, @types/json-schema@npm:^7.0.8, @types/json-schema@npm:^7.0.9":
   version: 7.0.15
   resolution: "@types/json-schema@npm:7.0.15"
   checksum: 10/1a3c3e06236e4c4aab89499c428d585527ce50c24fe8259e8b3926d3df4cfbbbcf306cfc73ddfb66cbafc973116efd15967020b0f738f63e09e64c7d260519e7
@@ -4823,6 +4834,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/node@npm:^22.6.1":
+  version: 22.6.1
+  resolution: "@types/node@npm:22.6.1"
+  dependencies:
+    undici-types: "npm:~6.19.2"
+  checksum: 10/98852ff9d4b1e9180d82010d5a639ddb3676741b1dee361ec52f59f3526634127f76d6a030db0ff7c5f2ac88b330f745cacce898d309b9262972860e9dba2c1b
+  languageName: node
+  linkType: hard
+
 "@types/node@npm:^8.0.0":
   version: 8.10.66
   resolution: "@types/node@npm:8.10.66"
@@ -4948,6 +4968,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/semver@npm:^7.5.0":
+  version: 7.5.8
+  resolution: "@types/semver@npm:7.5.8"
+  checksum: 10/3496808818ddb36deabfe4974fd343a78101fa242c4690044ccdc3b95dcf8785b494f5d628f2f47f38a702f8db9c53c67f47d7818f2be1b79f2efb09692e1178
+  languageName: node
+  linkType: hard
+
 "@types/send@npm:*":
   version: 0.17.4
   resolution: "@types/send@npm:0.17.4"
@@ -5040,121 +5067,126 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@typescript-eslint/eslint-plugin@npm:^7.0.2":
-  version: 7.18.0
-  resolution: "@typescript-eslint/eslint-plugin@npm:7.18.0"
+"@typescript-eslint/eslint-plugin@npm:^6.0.0":
+  version: 6.21.0
+  resolution: "@typescript-eslint/eslint-plugin@npm:6.21.0"
   dependencies:
-    "@eslint-community/regexpp": "npm:^4.10.0"
-    "@typescript-eslint/scope-manager": "npm:7.18.0"
-    "@typescript-eslint/type-utils": "npm:7.18.0"
-    "@typescript-eslint/utils": "npm:7.18.0"
-    "@typescript-eslint/visitor-keys": "npm:7.18.0"
+    "@eslint-community/regexpp": "npm:^4.5.1"
+    "@typescript-eslint/scope-manager": "npm:6.21.0"
+    "@typescript-eslint/type-utils": "npm:6.21.0"
+    "@typescript-eslint/utils": "npm:6.21.0"
+    "@typescript-eslint/visitor-keys": "npm:6.21.0"
+    debug: "npm:^4.3.4"
     graphemer: "npm:^1.4.0"
-    ignore: "npm:^5.3.1"
+    ignore: "npm:^5.2.4"
     natural-compare: "npm:^1.4.0"
-    ts-api-utils: "npm:^1.3.0"
+    semver: "npm:^7.5.4"
+    ts-api-utils: "npm:^1.0.1"
   peerDependencies:
-    "@typescript-eslint/parser": ^7.0.0
-    eslint: ^8.56.0
+    "@typescript-eslint/parser": ^6.0.0 || ^6.0.0-alpha
+    eslint: ^7.0.0 || ^8.0.0
   peerDependenciesMeta:
     typescript:
       optional: true
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     typechain: "npm:^8.3.0"
-    typescript: "npm:^5.5.0"
+    typescript: "npm:5.3"
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     remark-preset-lint-recommended: "npm:^7.0.0"
     sass: "npm:^1.79.3"
-    typescript: "npm:~5.5.0"
+    typescript: "npm:5.3"
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   resolution: "excubiae-website@workspace:apps/website"
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+    typescript: "npm:5.3"
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-    typescript: "npm:^5.5.0"
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