diff --git a/.eslintrc.js b/.eslintrc.js
index 734c2b8..aeb0276 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -20,6 +20,7 @@ module.exports = {
         "@typescript-eslint"
 	],
 	rules: {
-      "arrow-parens": ["error", "always"]
+      "arrow-parens": ["error", "always"],
+      "indent": ["error", 4]
 	},
 };
diff --git a/package.json b/package.json
index c14040d..9dad55f 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,8 @@
     "build": "parcel build index.html --no-source-maps",
     "prebuild": "yarn run typecheck",
     "typecheck": "tsc --noEmit",
-    "lint": "eslint src/*"
+    "lint": "eslint src/*",
+    "lint-fix": "eslint src/* --fix"
   },
   "devDependencies": {
     "@parcel/transformer-image": "2.0.0-rc.0",
diff --git a/src/saimiar_morphology.ts b/src/saimiar_morphology.ts
index ec992a5..75de8cf 100644
--- a/src/saimiar_morphology.ts
+++ b/src/saimiar_morphology.ts
@@ -1,99 +1,110 @@
 const rootEndingPair = (str) => ({root: str.slice(0, -1), ending: str.slice(-1)});
 
-function declineSaimiar(entry) {
-	const split = entry.sai.split(' ');
-	const sai = split.at(-1);
-	const morph = entry.morph_type;
+type SaimiarDeclension = {
+    abs: string;
+    erg: string;
+    adp: string;
+    all: string;
+    loc: string;
+    ell: string;
+    inst: string;
+    rel: string;
+};
 
-	if (morph === '-V') {
-		return vowelDeclension(sai);
-	}
+function declineSaimiar(entry): SaimiarDeclension {
+    const split = entry.sai.split(' ');
+    const sai = split.at(-1);
+    const morph = entry.morph_type;
 
-	if (morph === '-a/i') {
-		return aiDeclension(sai);
-	}
+    if (morph === '-V') {
+        return vowelDeclension(sai);
+    }
 
-	if (morph === 'e-') {
-		return initalDeclension(sai);
-	}
+    if (morph === '-a/i') {
+        return aiDeclension(sai);
+    }
 
-	if (morph === '-C') {
-		return consonantDeclension(sai);
-	}
+    if (morph === 'e-') {
+        return initalDeclension(sai);
+    }
 
-	console.warn(`Can't decline entry '${entry.sai}'`);
-	console.log(entry);
-	return null;
+    if (morph === '-C') {
+        return consonantDeclension(sai);
+    }
+
+    console.warn(`Can't decline entry '${entry.sai}'`);
+    console.log(entry);
+    return null;
 }
 
-function vowelDeclension(sai: string) {
-	const {root, ending} = rootEndingPair(sai);
-	const adpEnding = ending === 'u' ? 'ys' : `${ending}s`;
+function vowelDeclension(sai: string): SaimiarDeclension {
+    const {root, ending} = rootEndingPair(sai);
+    const adpEnding = ending === 'u' ? 'ys' : `${ending}s`;
 
-	return {
-		abs: `${root}${ending}`,
-		erg: `${root}${ending}na`,
-		adp: `${root}${adpEnding}`,
-		all: `so${root}${adpEnding}`,
-		loc: `${root}${ending}xa`,
-		ell: `tlê${root}${adpEnding}`,
-		inst: `${root}${ending}ŕa`,
-		rel: `${root}${ending}źi`,
-	};
+    return {
+        abs: `${root}${ending}`,
+        erg: `${root}${ending}na`,
+        adp: `${root}${adpEnding}`,
+        all: `so${root}${adpEnding}`,
+        loc: `${root}${ending}xa`,
+        ell: `tlê${root}${adpEnding}`,
+        inst: `${root}${ending}ŕa`,
+        rel: `${root}${ending}źi`,
+    };
 }
 
-function aiDeclension(sai: string) {
-	const {root, ending} = rootEndingPair(sai);
-	return {
-		abs: `${root}${ending}`,
-		erg: `${root}iad`,
-		adp: `${root}i`,
-		all: `so${root}i`,
-		loc: `${root}iath`,
-		ell: `tlê${root}i`,
-		inst: `${root}iar`,
-		rel: `${root}iai`,
-	};
+function aiDeclension(sai: string): SaimiarDeclension {
+    const {root, ending} = rootEndingPair(sai);
+    return {
+        abs: `${root}${ending}`,
+        erg: `${root}iad`,
+        adp: `${root}i`,
+        all: `so${root}i`,
+        loc: `${root}iath`,
+        ell: `tlê${root}i`,
+        inst: `${root}iar`,
+        rel: `${root}iai`,
+    };
 }
 
-function consonantDeclension(sai: string) {
-	const split = rootEndingPair(sai);
-	const root = split.ending === 'ø' ? split.root : sai;
-	const absFinal = split.ending === 'ø' ? 'ø' : '';
+function consonantDeclension(sai: string): SaimiarDeclension {
+    const split = rootEndingPair(sai);
+    const root = split.ending === 'ø' ? split.root : sai;
+    const absFinal = split.ending === 'ø' ? 'ø' : '';
 
-	return {
-		abs: `${root}${absFinal}`,
-		erg: `${root}ad`,
-		adp: `${root}e`,
-		all: `so${root}i`,
-		loc: `${root}ak`,
-		ell: `tlê${root}i`,
-		inst: `${root}ar`,
-		rel: `${root}ai`,
-	};
+    return {
+        abs: `${root}${absFinal}`,
+        erg: `${root}ad`,
+        adp: `${root}e`,
+        all: `so${root}i`,
+        loc: `${root}ak`,
+        ell: `tlê${root}i`,
+        inst: `${root}ar`,
+        rel: `${root}ai`,
+    };
 }
 
 const vowels = ['a', 'e', 'ê', 'i', 'o', 'ô', 'u', 'y'];
 
-function initalDeclension(sai: string) {
-	const initial = sai.slice(0, 1);
-	const root = sai.slice(1);
+function initalDeclension(sai: string): SaimiarDeclension {
+    const initial = sai.slice(0, 1);
+    const root = sai.slice(1);
 
-	const finalRootSound = root.slice(-1);
-	const finalVowel = vowels.includes(finalRootSound);
-	const instEnding = finalVowel ? 'ŕø' : 'ar';
-	const relEnding = finalVowel ? 'źi' : 'ai';
+    const finalRootSound = root.slice(-1);
+    const finalVowel = vowels.includes(finalRootSound);
+    const instEnding = finalVowel ? 'ŕø' : 'ar';
+    const relEnding = finalVowel ? 'źi' : 'ai';
 
-	return {
-		abs: `${initial}${root}`,
-		erg: `da${root}`,
-		adp: `i${root}`,
-		all: `so${root}`,
-		loc: `xa${root}`,
-		ell: `tlê${root}`,
-		inst: `i${root}${instEnding}`,
-		rel: `${initial}${root}${relEnding}`,
-	};
+    return {
+        abs: `${initial}${root}`,
+        erg: `da${root}`,
+        adp: `i${root}`,
+        all: `so${root}`,
+        loc: `xa${root}`,
+        ell: `tlê${root}`,
+        inst: `i${root}${instEnding}`,
+        rel: `${initial}${root}${relEnding}`,
+    };
 }
 
-export {declineSaimiar};
+export {declineSaimiar, SaimiarDeclension};