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libxml2
<doc> <!-- at least one present --> <z-o> <b/> </z-o> <o-o> <c/> </o-o> <z-u> <d/> </z-u> <o-u> <e/> </o-u> <z-3> <f/> </z-3> <o-3> <g/> </o-3> <!-- more than one present when allowed --> <z-o> <b/> </z-o> <o-o> <c/> </o-o> <z-u> <d/> <d/> <d/> </z-u> <o-u> <e/> <e/> <e/> </o-u> <z-3> <f/> <f/> <f/> </z-3> <o-3> <g/> <g/> <g/> </o-3> <!-- min 0 are not present --> <z-o/> <o-o> <c/> </o-o> <z-u/> <o-u> <e/> </o-u> <z-3/> <o-3> <g/> </o-3> </doc>