Write a predicate function
<p>I want to write a predicate function - <code>func is_subse</code> - that takes two tuples <code>seq1, seq2</code> as arguments and determines if <code>seq2</code> is a subsequence of <code>seq1</code></p>

<p>This is the code I have so far:</p>

<pre><code>def is_sub(seq1, seq2):
    # returns true if seq2 is a subseq of seq1
</code></pre>
