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<!ELEMENT
address (name, email, phone, birthday)>
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<!ELEMENT name
(first, last)>
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<!ELEMENT
first (#PCDATA)>
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<!ELEMENT last
(#PCDATA)>
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<!ELEMENT
email (#PCDATA)>
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<!ELEMENT
phone (#PCDATA)>
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<!ELEMENT
birthday (year, month, day)>
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<!ELEMENT year
(#PCDATA)>
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<!ELEMENT
month (#PCDATA)>
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<!ELEMENT day
(#PCDATA)>
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