static/chunks/766-12dbb05e2adf85ab.js","4150","static/chunks/app/courses/%5BcourseSlug%5D/lessons/%5BunitSlug%5D/page-1fc213a0f4568bd8.js"],"Image"] 3b:T6d3,private static final Set STOPWORDS = new HashSet<>(Arrays.asList( "the", "and", "is", "in", "of", "to", "a", "that", "for", "on", "with", "as", "it", "by", "this", "are", "was", "at", "from", "or", "be", "which", "not", "can", "also", "have", "has", "had", "we", "they", "you", "he", "she", "his", "her", "its", "our", "us", "their", "them", "i", "do", "does", "did", "just", "so", "if", "may", "will", "shall", "more", "most", "some", "many", "any", "all", "what", "about", "would", "could", "should", "where", "when", "why", "how" )); private static List extractWords(String text) { List words = new ArrayList<>(); Pattern pattern = Pattern.compile("\\b\\w+\\b"); Matcher matcher = pattern.matcher(text); while (matcher.find()) { words.add(matcher.group()); } return words; } public static String extractRefinementKeyword(String chunkText, String currentQuery) { List chunkWords = extractWords(chunkText.toLowerCase()); Set queryWords = new HashSet<>(extractWords(currentQuery.toLowerCase())); // Filter out stopwords, words already in the query, or very short words List candidateWords = chunkWords.stream() .filter(w -> !STOPWORDS.contains(w) && !queryWords.contains(w) && w.length() > 4) .collect(Collectors.toList()); if (candidateWords.isEmpty()) { return ""; } // Pick the longest candidate word return candidateWords.stream().max(Comparator.comparingInt(String::length)).orElse(""); } public static String refineQuery(String currentQuery, String refineWord) { if (refineWord.isEmpty()) { return currentQuery; } return currentQuery + " " + refineWord; }3c:T44c,private static final double IMPROVEMENT_THRESHOLD = 0.02; public static List> iterativeRetrieval(String query, Coll