t before the iterator <code>it</code> will remain in the current path and the part starting with <code>it</code> will put into <code>tpath</code>. If <code>tpath</code> have arcs before the operation they are removed first. The time complexity of this function is O(1) plus the the time of emtying <code>tpath</code>. If <code>it</code> is <code>INVALID</code> then it just clears <code>tpath</code> </p>

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