export default function uncommonFromSentences(
    s1: string,
    s2: string,
): string[] {
    const a = s1.split(" ");

    const b = s2.split(" ");

    const cnts = new Map<string, number>();

    for (const word of [...a, ...b]) {
        cnts.set(word, (cnts.get(word) ?? 0) + 1);
    }

    return Array.from(cnts.keys()).filter((k) => 1 === cnts.get(k));
}