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<!DOCTYPE html>
<html>
<body style="width: 0">
<span style="border: 2px solid blue; border-right: none"></span>
<span style="display: block"></span>
<span style="border: 2px solid blue; border-left: none; border-right: none">
a b
</span>
<span style="display: block"></span>
<span style="border: 2px solid blue; border-left: none;">
c
</span>
</body>
</html>