edit pass on T3,4,5, updated images

src/site/docs/tutorials/add-elements/examples/anagram/anagram.dart

+import 'dart:html';
+import 'dart:math';
+
+// should remove tiles from here when they are selected otherwise the ratio is off.
+
+String scrabbleLetters = 'aaaaaaaaabbccddddeeeeeeeeeeeeffggghhiiiiiiiiijkllllmmnnnnnnooooooooppqrrrrrrssssttttttuuuuvvwwxyyz**';
+
+List<ButtonElement> buttons = new List();
+Element letterpile;
+Element result;
+ButtonElement clearButton;
+Element value;
+int wordvalue = 0;
+
+Map scrabbleValues = { 'a':1, 'e':1, 'i':1, 'l':1, 'n':1,
+                       'o':1, 'r':1, 's':1, 't':1, 'u':1,
+                       'd':2, 'g':2, 'b':3, 'c':3, 'm':3,
+                       'p':3, 'f':4, 'h':4, 'v':4, 'w':4,
+                       'y':4, 'k':5, 'j':8, 'x':8, 'q':10,
+                       'z':10, '*':0 };
+
+void main() {
+  letterpile = query("#letterpile");
+  result = query("#result");
+  value = query("#value");
+  
+  clearButton = query("#clearButton");
+  clearButton.onClick.listen(newletters);
+  
+  generateNewLetters();
+}
+
+void moveLetter(Event e) {
+  Element letter = e.target;
+  if (letter.parent == letterpile) {
+    result.children.add(letter);
+    wordvalue += scrabbleValues[letter.text];
+    value.text = "$wordvalue";
+  } else {
+    letterpile.children.add(letter);
+    wordvalue -= scrabbleValues[letter.text];
+    value.text = "$wordvalue";
+  }
+}
+
+void newletters(Event e) {
+  letterpile.children.clear();
+  result.children.clear();
+  generateNewLetters();
+}
+
+generateNewLetters() {
+  Random indexGenerator = new Random();
+  wordvalue = 0;
+  value.text = '';
+  buttons.clear();
+  for (var i = 0; i < 7; i++) {
+    int letterIndex = indexGenerator.nextInt(scrabbleLetters.length);
+      // should remove the letter from scrabbleLetters to keep the ratio correct
+    buttons.add(new ButtonElement());
+    buttons[i].classes.add("letter");
+    buttons[i].onClick.listen(moveLetter);
+    buttons[i].text = scrabbleLetters[letterIndex];
+    letterpile.children.add(buttons[i]);
+  }
+}
+