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<?xml version="1.0"?>
<page>
<!-- valid date/times -->
<sum>
<date dur='PT1M'/>
<date dur='PT2M'/>
</sum>
<sum>
<date dur='P1DT2H'/>
<date dur='PT3M'/>
<date dur='PT4S'/>
</sum>
<sum>
<date dur='PT20M'/>
<date dur='PT20M'/>
<date dur='PT20M'/>
</sum>
<sum>
<date dur='PT01S'/>
<date dur='PT02S'/>
<date dur='PT04S'/>
<date dur='PT8S'/>
<date dur='PT16S'/>
<date dur='PT32S'/>
</sum>
<!-- Base case: sum of 1 node -->
<sum>
<date dur='P1M'/>
</sum>
<!-- Non-normalized input -->
<sum>
<date dur='PT70M'/>
</sum>
<sum>
<date dur='PT70M'/>
<date dur='P13M'/>
</sum>
<!-- Negative durations -->
<sum>
<date dur='PT70M'/>
<date dur='-PT30M'/>
</sum>
<sum>
<date dur='PT1H10M'/>
<date dur='-PT30M'/>
<date dur='-PT30S'/>
</sum>
<!-- Zero sum -->
<sum>
<date dur='PT1M'/>
<date dur='-PT1M'/>
</sum>
</page>
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