const getTeamArticles = (teamId) => {
    let team = teams.find(t => t.id == teamId);
    let articleStrings = team.members.map(memberId => {
        let author = authors.find(a => a.id == memberId);
        let authorArticles = articles.filter(
            article => (article.authors && article.authors.includes(memberId))
        );
        if (authorArticles.length == 0)
            return `${author.name} wrote 0 articles.`;
        if (authorArticles.length == 1)
            return `${author.name} wrote an article '${authorArticles[0].text}'.`;
        if (authorArticles.length == 2)
            return `${author.name} wrote an articles '${authorArticles[0].text}' and '${authorArticles[1].text}'.`;
        return `${author.name} wrote an articles '${authorArticles[0].text}', '${authorArticles[1].text}' and ${authorArticles.length-2} more.`;
    });
    return articleStrings.join('\n');
};