<!doctype doc [
<!entity % big "(a|b|c|d|e|f|g|h|i|j|k|l|m|n|o|p|q|r|s|t|u|v|w)">
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<!element doc - o (%big; , %big; , %big;, %big;)?>
<!element bad - - (%big; , %big; , %big;, %big;, a)>>
<!element %big; - - (#pcdata)>
]>
<doc>
