diff --git a/.github/workflows/ci_js.yaml b/.github/workflows/ci_js.yaml
new file mode 100644
index 0000000..8170cd1
--- /dev/null
+++ b/.github/workflows/ci_js.yaml
@@ -0,0 +1,48 @@
+name: "CI: JS"
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    paths:
+      - "ainu-utils/**"
+      - "ainu-utils-js/**"
+  workflow_dispatch:
+
+defaults:
+  run:
+    working-directory: ainu-utils-js
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 2
+
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
+      
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+
+      - name: Install wasm-pack
+        run:  curl https://drager.github.io/wasm-pack/installer/init.sh -sSf | bash
+
+      - name: Build
+        run: |
+          wasm-pack build --target nodejs
+          node ./patch.js
+          ls pkg
+
+      - name: "Debug: Upload"
+        uses: actions/upload-artifact@v6
+        with:
+          name: pkg
+          path: ainu-utils-js/pkg/
+
+      - name: Test
+        run: npm exec vitest
diff --git a/.github/workflows/ci_python.yaml b/.github/workflows/ci_python.yaml
index 6d62062..de38c5a 100644
--- a/.github/workflows/ci_python.yaml
+++ b/.github/workflows/ci_python.yaml
@@ -5,15 +5,16 @@ on:
     branches:
       - main
   pull_request:
-    paths-ignore:
-      - "ainu-utils-js/**"
+    paths:
+      - "ainu-utils/**"
+      - "ainu-utils-python/**"
   workflow_dispatch:
 
 jobs:
-  linux:
+  test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 2
 
diff --git a/.github/workflows/ci_rust.yaml b/.github/workflows/ci_rust.yaml
index 24f6d68..a91d0fd 100644
--- a/.github/workflows/ci_rust.yaml
+++ b/.github/workflows/ci_rust.yaml
@@ -1,4 +1,3 @@
----
 name: "CI: Rust"
 
 on:
@@ -22,15 +21,12 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 2
 
       - name: Setup Rust
-        uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          override: true
+        uses: dtolnay/rust-toolchain@stable
 
       - name: Install cargo-llvm-cov
         uses: taiki-e/install-action@cargo-llvm-cov
diff --git a/.github/workflows/release_js.yaml b/.github/workflows/release_js.yaml
index 70204cd..afef38c 100644
--- a/.github/workflows/release_js.yaml
+++ b/.github/workflows/release_js.yaml
@@ -1,4 +1,3 @@
----
 name: "Release: JS"
 
 on:
@@ -17,19 +16,16 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 2
 
       - name: Setup Rust
-        uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          override: true
+        uses: dtolnay/rust-toolchain@stable
       
       # https://github.com/npm/cli/issues/6184#issuecomment-1544496444
       - name: Setup Node.js
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v6
         with:
           registry-url: "https://registry.npmjs.org"
 
@@ -39,7 +35,7 @@ jobs:
       - name: Build
         run: |
           wasm-pack build --target nodejs
-          node ./patch.mjs
+          node ./patch.js
           cd ./pkg
           npm pkg set name="ainu-utils"
           echo "//registry.npmjs.org/:_authToken=\${NPM_TOKEN}" > .npmrc
diff --git a/.github/workflows/release_rust.yaml b/.github/workflows/release_rust.yaml
index 47a9d53..9446870 100644
--- a/.github/workflows/release_rust.yaml
+++ b/.github/workflows/release_rust.yaml
@@ -1,4 +1,3 @@
----
 name: "Release: Rust"
 
 env:
@@ -19,13 +18,10 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
-      - name: Install Rust
-        uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          override: true
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
 
       - name: Publish package rust
         if: ${{ !contains(github.ref, 'rc') }}
diff --git a/ainu-utils-js/.gitignore b/ainu-utils-js/.gitignore
new file mode 100644
index 0000000..3c3629e
--- /dev/null
+++ b/ainu-utils-js/.gitignore
@@ -0,0 +1 @@
+node_modules
diff --git a/ainu-utils-js/Cargo.toml b/ainu-utils-js/Cargo.toml
index 2a9b358..72341e7 100644
--- a/ainu-utils-js/Cargo.toml
+++ b/ainu-utils-js/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "ainu-utils-js"
 version = "0.5.1"
-edition = "2021"
+edition = "2024"
 description = "A collection of utilities for the Ainu language"
 license = "MIT"
 
diff --git a/ainu-utils-js/package-lock.json b/ainu-utils-js/package-lock.json
new file mode 100644
index 0000000..b1a8baa
--- /dev/null
+++ b/ainu-utils-js/package-lock.json
@@ -0,0 +1,1374 @@
+{
+  "name": "ainu-utils-js",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "dependencies": {
+        "vitest": "^4.0.18"
+      }
+    },
+    "node_modules/@esbuild/aix-ppc64": {
+      "version": "0.27.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.27.3.tgz",
+      "integrity": "sha512-9fJMTNFTWZMh5qwrBItuziu834eOCUcEqymSH7pY+zoMVEZg3gcPuBNxH1EvfVYe9h0x/Ptw8KBzv7qxb7l8dg==",
+      "cpu": [
+        "ppc64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "aix"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-arm": {
+      "version": "0.27.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.27.3.tgz",
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+        "arm"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-arm64": {
+      "version": "0.27.3",
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+        "happy-dom": "*",
+        "jsdom": "*"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@opentelemetry/api": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser-playwright": {
+          "optional": true
+        },
+        "@vitest/browser-preview": {
+          "optional": true
+        },
+        "@vitest/browser-webdriverio": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    }
+  }
+}
diff --git a/ainu-utils-js/package.json b/ainu-utils-js/package.json
new file mode 100644
index 0000000..ad9e802
--- /dev/null
+++ b/ainu-utils-js/package.json
@@ -0,0 +1,6 @@
+{
+  "type": "module",
+  "dependencies": {
+    "vitest": "^4.0.18"
+  }
+}
diff --git a/ainu-utils-js/patch.mjs b/ainu-utils-js/patch.js
similarity index 100%
rename from ainu-utils-js/patch.mjs
rename to ainu-utils-js/patch.js
diff --git a/ainu-utils-js/src/lib.rs b/ainu-utils-js/src/lib.rs
index 87ef8b6..fd94ddc 100644
--- a/ainu-utils-js/src/lib.rs
+++ b/ainu-utils-js/src/lib.rs
@@ -11,9 +11,41 @@ pub fn to_kana(text: &str) -> String {
     kana::to_kana(text)
 }
 
+pub enum NumberToWordsError {
+    NoNounError,
+    InvalidFormError,
+    CoreError(numbers::NumberToWordsError),
+}
+
+impl From<NumberToWordsError> for JsValue {
+    fn from(value: NumberToWordsError) -> Self {
+        match value {
+            NumberToWordsError::NoNounError => JsValue::from("No noun given"),
+            NumberToWordsError::InvalidFormError => JsValue::from("Invalid form given"),
+            NumberToWordsError::CoreError(err) => match err {
+                numbers::NumberToWordsError::OutOfRange => JsValue::from("Number out of range"),
+            },
+        }
+    }
+}
+
 #[wasm_bindgen]
-pub fn number_to_words(input: i32) -> String {
-    numbers::parse(input).unwrap().to_string()
+pub fn number_to_words(input: i32, form: String, noun: Option<String>) -> Result<String, JsValue> {
+    let numeral_form = match form.as_str() {
+        "human" => Ok(numbers::NumeralForm::HumanCount),
+        "thing" => Ok(numbers::NumeralForm::ThingCount),
+        "serial" => Ok(numbers::NumeralForm::Serial),
+        "adnominal" => match noun {
+            Some(noun) => Ok(numbers::NumeralForm::Adnominal(noun)),
+            None => Err(NumberToWordsError::NoNounError),
+        },
+        _ => Err(NumberToWordsError::InvalidFormError),
+    }?;
+
+    let words =
+        numbers::number_to_words(input, &numeral_form).map_err(NumberToWordsError::CoreError)?;
+
+    Ok(words)
 }
 
 #[wasm_bindgen]
diff --git a/ainu-utils-js/tests/ainu_utils.test.js b/ainu-utils-js/tests/ainu_utils.test.js
new file mode 100644
index 0000000..4194461
--- /dev/null
+++ b/ainu-utils-js/tests/ainu_utils.test.js
@@ -0,0 +1,7 @@
+import { test, expect } from "vitest";
+import { numbers_to_words } from "../pkg/ainu_utils_js.js";
+
+test("numbers_to_words", () => {
+	const words = numbers_to_words(31, "adnominal", "cape");
+	expect(words).toBe("sine cape ikasma wan cape etuhotne cape");
+});
diff --git a/ainu-utils-python/Cargo.toml b/ainu-utils-python/Cargo.toml
index c763a85..beca70d 100644
--- a/ainu-utils-python/Cargo.toml
+++ b/ainu-utils-python/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "ainu-utils-python"
 version = "0.5.1"
-edition = "2021"
+edition = "2024"
 description = "A collection of utilities for the Ainu language"
 license = "MIT"
 
diff --git a/ainu-utils-python/ainu_utils.pyi b/ainu-utils-python/ainu_utils.pyi
index 8e99e3c..3656aaa 100644
--- a/ainu-utils-python/ainu_utils.pyi
+++ b/ainu-utils-python/ainu_utils.pyi
@@ -1,5 +1,5 @@
 # https://www.maturin.rs/project_layout#adding-python-type-information
 def tokenize(text: str, keep_whitespace: bool) -> list[str]: ...
 def to_kana(text: str) -> str: ...
-def number_to_words(number: int) -> str: ...
+def number_to_words(number: int, form: str, *, noun: str | None) -> str: ...
 def syllabicate(text: str) -> list[str]: ...
diff --git a/ainu-utils-python/src/lib.rs b/ainu-utils-python/src/lib.rs
index 679b083..13bc037 100644
--- a/ainu-utils-python/src/lib.rs
+++ b/ainu-utils-python/src/lib.rs
@@ -1,5 +1,6 @@
 extern crate ainu_utils as ainu_utils_rust;
 
+use pyo3::exceptions::PyValueError;
 use pyo3::prelude::*;
 
 #[pyfunction]
@@ -12,9 +13,48 @@ fn to_kana(text: &str) -> String {
     ainu_utils_rust::kana::to_kana(text)
 }
 
+pub enum NumberToWordsError {
+    NoNounError,
+    InvalidFormError,
+    CoreError(ainu_utils_rust::numbers::NumberToWordsError),
+}
+
+impl From<NumberToWordsError> for PyErr {
+    fn from(value: NumberToWordsError) -> Self {
+        match value {
+            NumberToWordsError::NoNounError => PyValueError::new_err("No noun given"),
+            NumberToWordsError::InvalidFormError => PyValueError::new_err("Invalid form given"),
+            NumberToWordsError::CoreError(err) => match err {
+                ainu_utils_rust::numbers::NumberToWordsError::OutOfRange => {
+                    PyValueError::new_err("Number out of range")
+                }
+            },
+        }
+    }
+}
+
 #[pyfunction]
-fn number_to_words(input: i32) -> String {
-    ainu_utils_rust::numbers::parse(input).unwrap().to_string()
+#[pyo3(signature = (input, form, noun=None))]
+fn number_to_words(
+    input: i32,
+    form: String,
+    noun: Option<String>,
+) -> Result<String, NumberToWordsError> {
+    let numeral_form = match form.as_str() {
+        "human" => Ok(ainu_utils_rust::numbers::NumeralForm::HumanCount),
+        "thing" => Ok(ainu_utils_rust::numbers::NumeralForm::ThingCount),
+        "serial" => Ok(ainu_utils_rust::numbers::NumeralForm::Serial),
+        "adnominal" => match noun {
+            Some(noun) => Ok(ainu_utils_rust::numbers::NumeralForm::Adnominal(noun)),
+            None => Err(NumberToWordsError::NoNounError),
+        },
+        _ => Err(NumberToWordsError::InvalidFormError),
+    }?;
+
+    let words = ainu_utils_rust::numbers::number_to_words(input, &numeral_form)
+        .map_err(NumberToWordsError::CoreError)?;
+
+    Ok(words)
 }
 
 #[pyfunction]
diff --git a/ainu-utils-python/tests/test_number_to_words.py b/ainu-utils-python/tests/test_number_to_words.py
index e920b5a..0480d58 100644
--- a/ainu-utils-python/tests/test_number_to_words.py
+++ b/ainu-utils-python/tests/test_number_to_words.py
@@ -1,6 +1,5 @@
 import ainu_utils
 
-
 def test_number_to_words():
-    result = ainu_utils.number_to_words(21)
-    assert result == "sine ikasma hotne"
+    result = ainu_utils.number_to_words(21, "adnominal", noun="yuk")
+    assert result == "sine yuk ikasma hotne yuk"
diff --git a/ainu-utils/Cargo.toml b/ainu-utils/Cargo.toml
index efaa86c..243fb08 100644
--- a/ainu-utils/Cargo.toml
+++ b/ainu-utils/Cargo.toml
@@ -8,4 +8,5 @@ license = "MIT"
 [dependencies]
 once_cell = "1.19.0"
 regex = "1.10.2"
+thiserror = "2.0.18"
 unicode-normalization = "0.1.23"
diff --git a/ainu-utils/examples/number.rs b/ainu-utils/examples/number.rs
index e0f547c..ec89d7a 100644
--- a/ainu-utils/examples/number.rs
+++ b/ainu-utils/examples/number.rs
@@ -1,10 +1,16 @@
-use ainu_utils::numbers::parse;
+use ainu_utils::numbers::{NumeralForm, parse};
 use std::env;
 
 fn main() {
     let args: Vec<String> = env::args().collect();
     let int = args[1].parse::<i32>().unwrap();
+    let kind = match args[2].as_str() {
+        "humans" => NumeralForm::HumanCount,
+        "things" => NumeralForm::ThingCount,
+        "serial" => NumeralForm::Serial,
+        nom => NumeralForm::Adnominal(nom.to_string()),
+    };
     let words = parse(int).unwrap();
 
-    println!("{:?}", words.to_string());
+    println!("{:?}", words.format(&kind));
 }
diff --git a/ainu-utils/src/numbers/expr.rs b/ainu-utils/src/numbers/expr.rs
index cbc4e35..c36240d 100644
--- a/ainu-utils/src/numbers/expr.rs
+++ b/ainu-utils/src/numbers/expr.rs
@@ -1,3 +1,91 @@
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum NumberToWordsError {
+    #[error("number out of range")]
+    OutOfRange,
+}
+
+pub enum NumeralForm {
+    HumanCount,
+    ThingCount,
+    Serial,
+    AdnominalBase,
+    Adnominal(String),
+}
+
+trait I32Ext {
+    fn format(&self, kind: &NumeralForm) -> String;
+}
+
+impl I32Ext for i32 {
+    fn format(&self, kind: &NumeralForm) -> String {
+        let v = match kind {
+            NumeralForm::HumanCount => match self {
+                1 => "sinen",
+                2 => "tun",
+                3 => "ren",
+                4 => "inen",
+                5 => "asiknen",
+                6 => "iwaniw",
+                7 => "arwaniw",
+                8 => "tupesaniw",
+                9 => "sinepesaniw",
+                10 => "waniw",
+                20 => "hotnen",
+                _ => unreachable!(),
+            },
+            NumeralForm::ThingCount => match self {
+                1 => "sinep",
+                2 => "tup",
+                3 => "rep",
+                4 => "inep",
+                5 => "asiknep",
+                6 => "iwanpe",
+                7 => "arwanpe",
+                8 => "tupesanpe",
+                9 => "sinepesanpe",
+                10 => "wanpe",
+                20 => "hotnep",
+                _ => unreachable!(),
+            },
+            NumeralForm::Serial => match self {
+                1 => "sinep",
+                2 => "tup",
+                3 => "rep",
+                4 => "inep",
+                5 => "asik",
+                6 => "iwan",
+                7 => "arwan",
+                8 => "tupes",
+                9 => "sinepes",
+                10 => "wan",
+                20 => "hot",
+                _ => unreachable!(),
+            },
+            NumeralForm::AdnominalBase => match self {
+                1 => "sine",
+                2 => "tu",
+                3 => "re",
+                4 => "ine",
+                5 => "asikne",
+                6 => "iwan",
+                7 => "arwan",
+                8 => "tupesan",
+                9 => "sinepesan",
+                10 => "wan",
+                20 => "hotne",
+                _ => unreachable!(),
+            },
+            NumeralForm::Adnominal(noun) => {
+                &format!("{} {}", self.format(&NumeralForm::AdnominalBase), noun)
+            }
+        };
+
+        v.to_string()
+    }
+}
+
 pub enum Expr {
     Int(i32),
     Add { lhs: Box<Expr>, rhs: Box<Expr> },
@@ -5,33 +93,26 @@ pub enum Expr {
     Mul { lhs: Box<Expr>, rhs: Box<Expr> },
 }
 
-impl ToString for Expr {
-    fn to_string(&self) -> String {
+impl Expr {
+    pub fn format(&self, kind: &NumeralForm) -> String {
         match self {
-            Expr::Int(i) => match i {
-                1 => "sine".to_string(),
-                2 => "tu".to_string(),
-                3 => "re".to_string(),
-                4 => "ine".to_string(),
-                5 => "asikne".to_string(),
-                6 => "iwan".to_string(),
-                7 => "arwan".to_string(),
-                8 => "tupesan".to_string(),
-                9 => "sinepesan".to_string(),
-                10 => "wan".to_string(),
-                20 => "hotne".to_string(),
-                _ => panic!("Invalid integer for Ainu number: {}", i),
-            },
-            Expr::Add { lhs, rhs } => format!("{} ikasma {}", lhs.to_string(), rhs.to_string()),
-            Expr::Sub { lhs, rhs } => format!("{} e{}", rhs.to_string(), lhs.to_string()),
-            Expr::Mul { lhs, rhs } => format!("{}{}", lhs.to_string(), rhs.to_string()),
+            Expr::Int(i) => i.format(kind),
+            Expr::Add { lhs, rhs } => format!("{} ikasma {}", lhs.format(kind), rhs.format(kind)),
+            Expr::Sub { lhs, rhs } => format!("{} e{}", rhs.format(kind), lhs.format(kind)),
+            Expr::Mul { lhs, rhs } => {
+                format!(
+                    "{}{}",
+                    lhs.format(&NumeralForm::AdnominalBase),
+                    rhs.format(kind)
+                )
+            }
         }
     }
 }
 
-pub fn parse(input: i32) -> Result<Expr, String> {
+pub fn parse(input: i32) -> Result<Expr, NumberToWordsError> {
     if input < 0 || 100 < input {
-        return Err("Input must be between 0 and 100".to_string());
+        return Err(NumberToWordsError::OutOfRange);
     }
 
     if input <= 10 || input == 20 {
@@ -60,3 +141,8 @@ pub fn parse(input: i32) -> Result<Expr, String> {
         rhs: Box::new(parse(tens)?),
     });
 }
+
+pub fn number_to_words(number: i32, form: &NumeralForm) -> Result<String, NumberToWordsError> {
+    let expr = parse(number)?;
+    Ok(expr.format(form))
+}
diff --git a/ainu-utils/src/numbers/expr_test.rs b/ainu-utils/src/numbers/expr_test.rs
index 4b5e79b..5b4ca51 100644
--- a/ainu-utils/src/numbers/expr_test.rs
+++ b/ainu-utils/src/numbers/expr_test.rs
@@ -1,28 +1,54 @@
+use crate::numbers::NumeralForm;
+
 use super::expr::parse;
 
 #[test]
 fn test_simple() {
     let expr = parse(1).unwrap();
-    assert_eq!(expr.to_string(), "sine");
+    assert_eq!(expr.format(&NumeralForm::ThingCount), "sinep");
 }
 
 #[test]
 fn test_ten_and_twenty() {
     let expr = parse(10).unwrap();
-    assert_eq!(expr.to_string(), "wan");
+    assert_eq!(expr.format(&NumeralForm::ThingCount), "wanpe");
 
     let expr = parse(20).unwrap();
-    assert_eq!(expr.to_string(), "hotne");
+    assert_eq!(expr.format(&NumeralForm::ThingCount), "hotnep");
 }
 
 #[test]
 fn test_addition() {
     let expr = parse(11).unwrap();
-    assert_eq!(expr.to_string(), "sine ikasma wan");
+    assert_eq!(expr.format(&NumeralForm::ThingCount), "sinep ikasma wanpe");
 }
 
 #[test]
 fn test_subtraction() {
     let expr = parse(90).unwrap();
-    assert_eq!(expr.to_string(), "wan easiknehotne");
+    assert_eq!(expr.format(&NumeralForm::ThingCount), "wanpe easiknehotnep");
+}
+
+#[test]
+fn test_serial() {
+    let expr = parse(31).unwrap();
+    assert_eq!(expr.format(&NumeralForm::Serial), "sinep ikasma wan etuhot");
+}
+
+#[test]
+fn test_human() {
+    let expr = parse(31).unwrap();
+    assert_eq!(
+        expr.format(&NumeralForm::HumanCount),
+        "sinen ikasma waniw etuhotnen"
+    );
+}
+
+#[test]
+fn test_noun() {
+    let expr = parse(31).unwrap();
+    assert_eq!(
+        expr.format(&NumeralForm::Adnominal("cape".to_string())),
+        "sine cape ikasma wan cape etuhotne cape"
+    );
 }