Method isComplete

java/Chapter 18/Question18_13/Rectangle.java:42–55

(int l, int h, WordGroup groupList)

    }
    
    public boolean isComplete(int l, int h, WordGroup groupList) {
		// Check if we have formed a complete rectangle.
		if (height == h) {
			// Check if each column is a word in the dictionary.
			for (int i = 0; i < l; i++) {
				String col = getColumn(i);
				if (!groupList.containsWord(col)) {
					return false; // Invalid rectangle.
				}
			}
			return true; // Valid Rectangle!
		}
		return false;
    }
    
    public boolean isPartialOK(int l, Trie trie) {
    	if (height == 0) {