diff --git a/hw2/claudio_maggioni/README.md b/hw2/claudio_maggioni/README.md
new file mode 100644
index 0000000..951cedb
--- /dev/null
+++ b/hw2/claudio_maggioni/README.md
@@ -0,0 +1,6 @@
+# HW2
+
+Optional features implemented:
+
+- bullet points in `mkIndenter()`
+- clock (exercise 3)
diff --git a/hw2/claudio_maggioni/script.js b/hw2/claudio_maggioni/script.js
index 8e1c6d2..ccef63c 100644
--- a/hw2/claudio_maggioni/script.js
+++ b/hw2/claudio_maggioni/script.js
@@ -173,23 +173,21 @@ function mkIndenter(line_size, level=0) {
     } else if (param === true) {
       return level;
     } else if (typeof param === 'string') {
-      console.log(param);
 
       let words = mkPrettyPrinter(line_size - level)(param);
-      words = words.map(e => ' ' * level + e);
+      words = words.map(e => ' '.repeat(level) + e);
       state.push(...words);
 
-      console.log(line_size, level, param, state);
     } else if (Array.isArray(param)) {
       for (const e of param) {
         if (typeof e !== 'string') {
           return;
         }
-        const words = mkPrettyPrinter(line_size - level - 2)(param);
-        state.push('* ' + words[0]);
+        const words = mkPrettyPrinter(line_size - level - 2)(e);
+        state.push(' '.repeat(level) + '* ' + words[0]);
 
         for (let i = 1; i < words.length; i++) {
-          state.push('  ' + words[i]);
+          state.push(' '.repeat(level + 2) + words[i]);
         }
       }
     } else if (param === void(0)) {
@@ -210,6 +208,12 @@ function mkIndenter(line_size, level=0) {
  * @return {number[]} An array indexed by the letter characters found in the string.
  */
 function letter_frequency(s) {
+  if (typeof s !== 'string') {
+    return;
+  }
+  const a = [];
+  Array.from(s.toLowerCase()).forEach(c => a[c] = !a[c] ? 1 : a[c] + 1);
+  return a;
 }
 
 /**
@@ -221,6 +225,21 @@ function letter_frequency(s) {
  * @return {undefined}
  */
 function display_letter_frequency(a, dom) {
+  if (typeof a !== 'object' || typeof dom !== 'object' || !dom) {
+    return;
+  }
+  const t = document.createElement('table');
+  for (const x in a) {
+    const r = document.createElement('tr');
+    const letter = document.createElement('td');
+    const element = document.createElement('td');
+    r.appendChild(letter);
+    r.appendChild(element);
+    letter.innerText = x;
+    element.innerText = '' + a[x];
+    t.appendChild(r);
+  }
+  dom.innerHTML = t.outerHTML;
 }
 
 /**
@@ -229,11 +248,37 @@ function display_letter_frequency(a, dom) {
  * @return {undefined}
  */
 function online_frequency_analysis(inputEl) {
+  const a = letter_frequency(inputEl.value);
+  display_letter_frequency(a, document.getElementById('frequency_table'));
 }
 
+
 /**
  * JavaScript Exercise 3
  */
-function clock(){
+function clock() {
+  const SECOND = 1000;
+  const MINUTE = SECOND * 60;
+  const HOUR = MINUTE * 60;
 
+  const digit = d => (d < 10 ? '0' : '') + d;
+  const format = (h, m, s) => digit(h) + ':' + digit(m) + ':' + digit(s);
+
+  function dateString(date) {
+    const epoch = Number.isInteger(date);
+    const h = epoch ? Math.floor(date / HOUR) : date.getHours();
+    const m = epoch ? Math.floor((date % HOUR) / MINUTE) : date.getMinutes();
+    const s = epoch ? Math.floor((date % MINUTE) / SECOND) : date.getSeconds();
+    return format(h, m, s);
+  }
+
+  const c = document.getElementById('clock');
+  let timer = false;
+
+  setInterval(() => {
+    d = new Date();
+    c.innerHTML = dateString(timer ? d - timer : d);
+  }, SECOND / 10);
+
+  return _ => timer = timer ? false : new Date();
 }