span class="o">(</span>B<span class="o">)</span>
f2<span class="o">(</span>B<span class="o">)</span>
f3<span class="o">(</span>B<span class="o">)</span>
f1<span class="o">(</span>C<span class="o">)</span>
f2<span class="o">(</span>C<span class="o">)</span>
f3<span class="o">(</span>C<span class="o">)</span>
stopped

<span class="c1"># possible output 3</span>
ready
f1<span class="o">(</span>A<span class="o">)</span>
f2<span class="o">(</span>A<span class="o">)</span>
f3<span class="o">(</span>A<span class="