diff --git a/packages/core/.eslintrc b/packages/core/.eslintrc
index e479339..216dd0a 100644
--- a/packages/core/.eslintrc
+++ b/packages/core/.eslintrc
@@ -2,7 +2,8 @@
   "root": true,
 	"rules": {
 		"indent": ["error", "tab"],
-		"no-tabs": "off"
+		"no-tabs": "off",
+    "no-continue": "off"
 	},
   "extends": [
     "lxsmnsyc/typescript"
diff --git a/packages/core/src/systems/en-US.ts b/packages/core/src/systems/en-US.ts
index 7a0d1e5..fb36361 100644
--- a/packages/core/src/systems/en-US.ts
+++ b/packages/core/src/systems/en-US.ts
@@ -132,7 +132,7 @@ const makeTensName = (tens: number, ones: number) => {
 	}
 
 	if (tens === 1) {
-		return TEN_PLUS_ONES[ones] as TenPlusOnesName;
+		return TEN_PLUS_ONES[ones] as unknown as TenPlusOnesName;
 	}
 
 	if (ones === 0) {
@@ -172,7 +172,12 @@ const makeDecillionsPrefix = (decillions: number, millions: number, milliaCount:
 	return `${onesPrefix}${tensName}` as const;
 };
 
-const makeCentillionsPrefix = (centillions: number, decillions: number, millions: number, milliaCount: number) => {
+const makeCentillionsPrefix = (
+	centillions: number,
+	decillions: number,
+	millions: number,
+	milliaCount: number,
+) => {
 	if (centillions === 0) {
 		return makeDecillionsPrefix(decillions, millions, milliaCount);
 	}
@@ -210,10 +215,10 @@ const getGroupName = (place: number, shortenMillia: boolean) => {
 
 				return [
 					[c + firstGroup[0], currentPlace],
-					...acc.slice(1)
+					...acc.slice(1),
 				];
 			},
-			[]
+			[],
 		)
 		.map(([group, groupPlace]) => [group.padStart(3, '0'), groupPlace] as const)
 		.filter(([group]) => group !== '000')
@@ -248,7 +253,11 @@ const getGroupName = (place: number, shortenMillia: boolean) => {
 	return `${groupGroups}${ILLION_SUFFIX}` as const;
 };
 
-export const makeGroup = (group: string, place: number, options?: Record<string, unknown>): string => {
+export const makeGroup = (
+	group: string,
+	place: number,
+	options?: Record<string, unknown>,
+): string => {
 	const makeHundredsArgs = group
 		.padStart(3, '0')
 		.split('')
@@ -274,7 +283,8 @@ export const group = (value: string): Group[] => {
 			decimalPoint: DECIMAL_POINT,
 			groupingSymbol: GROUPING_SYMBOL,
 			exponentDelimiter,
-		})
+		},
+	)
 		.split(exponentDelimiter);
 	const exponent = Number(exponentString);
 	const significantDigits = significand.replace(DECIMAL_POINT, '');
@@ -288,7 +298,7 @@ export const group = (value: string): Group[] => {
 				lastGroupDigits[currentPlaceInGroup] = c;
 				return [...acc.slice(0, -1) ?? [], [
 					lastGroupDigits.join(''),
-					currentPlace
+					currentPlace,
 				]];
 			}
 			return [...acc, [c.padEnd(3, '0'), currentPlace]];
@@ -316,8 +326,8 @@ export const makeNegative = (s: string) => (
 	`${NEGATIVE} ${s}`
 );
 
-export const tokenize = (s: string) => (
-	s.split(' ').filter((s) => s.length > 0)
+export const tokenize = (stringValue: string) => (
+	stringValue.split(' ').filter((maybeToken) => maybeToken.length > 0)
 );
 
 const FINAL_TOKEN = '';
@@ -328,9 +338,7 @@ const getGroupFromGroupName = (groupName: string) => {
 	}
 
 	const groupNameBase = groupName.replace(ILLION_SUFFIX, '');
-	const specialMillions = MILLIONS_SPECIAL_PREFIXES.findIndex((p) => {
-		return groupNameBase === p;
-	});
+	const specialMillions = MILLIONS_SPECIAL_PREFIXES.findIndex((p) => groupNameBase === p);
 
 	if (specialMillions > -1) {
 		return 1 + specialMillions;
@@ -338,7 +346,7 @@ const getGroupFromGroupName = (groupName: string) => {
 
 	let groupNameCurrent = groupNameBase;
 
-	let millias = [0];
+	const millias = [0];
 	let milliaIndex = 0;
 
 	while (groupNameCurrent.length > 0) {
@@ -346,9 +354,9 @@ const getGroupFromGroupName = (groupName: string) => {
 			break;
 		}
 
-		const centillions = CENTILLIONS_PREFIXES.findIndex((p) => {
-			return p.length > 0 && groupNameCurrent.startsWith(p);
-		});
+		const centillions = CENTILLIONS_PREFIXES.findIndex((p) => (
+			p.length > 0 && groupNameCurrent.startsWith(p)
+		));
 
 		if (centillions > -1) {
 			milliaIndex = 0;
@@ -357,9 +365,9 @@ const getGroupFromGroupName = (groupName: string) => {
 			continue;
 		}
 
-		const decillions = DECILLIONS_PREFIXES.findIndex((p) => {
-			return p.length > 0 && groupNameCurrent.startsWith(p);
-		});
+		const decillions = DECILLIONS_PREFIXES.findIndex((p) => (
+			p.length > 0 && groupNameCurrent.startsWith(p)
+		));
 
 		if (decillions > -1) {
 			milliaIndex = 0;
@@ -368,9 +376,9 @@ const getGroupFromGroupName = (groupName: string) => {
 			continue;
 		}
 
-		const millions = MILLIONS_PREFIXES.findIndex((p) => {
-			return p.length > 0 && groupNameCurrent.startsWith(p);
-		});
+		const millions = MILLIONS_PREFIXES.findIndex((p) => (
+			p.length > 0 && groupNameCurrent.startsWith(p)
+		));
 
 		if (millions > -1) {
 			milliaIndex = 0;
@@ -407,7 +415,7 @@ const getGroupFromGroupName = (groupName: string) => {
 		millias
 			.map((s) => s.toString().padStart(3, '0'))
 			.reverse()
-			.join('')
+			.join(''),
 	);
 
 	return 1 + bigGroupPlace;
@@ -415,11 +423,11 @@ const getGroupFromGroupName = (groupName: string) => {
 
 enum ParseGroupsMode {
 	INITIAL = 'unknown',
-	ONES = 'ones',
-	TENS = 'tens',
-	TEN_PLUS_ONES = 'tenPlusOnes',
-	HUNDRED = 'hundred',
-	THOUSAND = 'thousand',
+	ONES_MODE = 'ones',
+	TENS_MODE = 'tens',
+	TEN_PLUS_ONES_MODE = 'tenPlusOnes',
+	HUNDRED_MODE = 'hundred',
+	THOUSAND_MODE = 'thousand',
 	DONE = 'done',
 }
 
@@ -435,7 +443,7 @@ export const parseGroups = (tokens: string[]) => {
 			const lastGroup = acc.groups.at(-1) ?? ['000', 0];
 
 			if (token === THOUSAND || token.endsWith(ILLION_SUFFIX)) {
-				if (acc.mode === ParseGroupsMode.ONES) {
+				if (acc.mode === ParseGroupsMode.ONES_MODE) {
 					const ones = ONES.findIndex((o) => o === acc.lastToken);
 					lastGroup[0] = `${lastGroup[0].slice(0, 2)}${ones}`;
 				}
@@ -446,24 +454,24 @@ export const parseGroups = (tokens: string[]) => {
 					...acc,
 					groups: [...acc.groups.slice(0, -1), lastGroup],
 					lastToken: token,
-					mode: ParseGroupsMode.THOUSAND,
-				}
+					mode: ParseGroupsMode.THOUSAND_MODE,
+				};
 			}
 
 			if (token === HUNDRED) {
-				if (acc.mode === ParseGroupsMode.ONES) {
+				if (acc.mode === ParseGroupsMode.ONES_MODE) {
 					const hundreds = ONES.findIndex((o) => o === acc.lastToken);
 					lastGroup[0] = `${hundreds}${lastGroup[0].slice(1)}`;
 					return {
 						...acc,
 						groups: [...acc.groups.slice(0, -1), lastGroup],
-						mode: ParseGroupsMode.HUNDRED,
+						mode: ParseGroupsMode.HUNDRED_MODE,
 					};
 				}
 			}
 
 			if (token === FINAL_TOKEN) {
-				if (acc.mode === ParseGroupsMode.ONES) {
+				if (acc.mode === ParseGroupsMode.ONES_MODE) {
 					const ones = ONES.findIndex((o) => o === acc.lastToken);
 					lastGroup[0] = `${lastGroup[0].slice(0, 2)}${ones}`;
 					lastGroup[1] = 0;
@@ -476,19 +484,19 @@ export const parseGroups = (tokens: string[]) => {
 			}
 
 			if (ONES.includes(token as OnesName)) {
-				if (acc.mode === ParseGroupsMode.THOUSAND) {
+				if (acc.mode === ParseGroupsMode.THOUSAND_MODE) {
 					return {
 						...acc,
 						lastToken: token,
-						mode: ParseGroupsMode.ONES,
+						mode: ParseGroupsMode.ONES_MODE,
 						groups: [...acc.groups, ['000', 0]],
-					}
+					};
 				}
 				return {
 					...acc,
 					lastToken: token,
-					mode: ParseGroupsMode.ONES,
-				}
+					mode: ParseGroupsMode.ONES_MODE,
+				};
 			}
 
 			const tenPlusOnes = TEN_PLUS_ONES.findIndex((t) => t === token);
@@ -497,8 +505,8 @@ export const parseGroups = (tokens: string[]) => {
 				return {
 					...acc,
 					lastToken: token,
-					mode: ParseGroupsMode.TEN_PLUS_ONES,
-					groups: [...acc.groups.slice(0, -1), lastGroup]
+					mode: ParseGroupsMode.TEN_PLUS_ONES_MODE,
+					groups: [...acc.groups.slice(0, -1), lastGroup],
 				};
 			}
 
@@ -508,7 +516,7 @@ export const parseGroups = (tokens: string[]) => {
 				return {
 					...acc,
 					lastToken: token,
-					mode: ParseGroupsMode.TENS,
+					mode: ParseGroupsMode.TENS_MODE,
 					groups: [...acc.groups.slice(0, -1), lastGroup],
 				};
 			}
@@ -533,11 +541,11 @@ export const combineGroups = (groups: Group[]) => {
 	const firstGroup = groupsSorted[0];
 	const firstGroupPlace = firstGroup[1];
 	const digits = groupsSorted.reduce(
-		(s, group) => {
-			const [groupDigits] = group;
-			return `${s}${groupDigits}`;
+		(previousDigits, thisGroup) => {
+			const [groupDigits] = thisGroup;
+			return `${previousDigits}${groupDigits}`;
 		},
-		''
+		'',
 	).replace(/^0+/, '') || '0';
 	const firstGroupDigits = firstGroup[0];
 	const firstGroupDigitsWithoutZeroes = firstGroupDigits.replace(/^0+/, '');