private static String chunking_and_replace(String[] complete_sentence_tokens, int start, int end, String replacement) {
		String element = "";
		for(int i = 0; i < complete_sentence_tokens.length; i++){
			if(i < start || i > end){
				element += complete_sentence_tokens[i];
				if(i < complete_sentence_tokens.length){
					element += " ";
				}
			}
			else if(i == end) {
				element += replacement + " ";
			}
		}
		return element;
	}