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\f0\fs24 \cf0 tuple credibility\
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often, in order to take advantage of the credibility it is necessary to establish the source of elements in the person element.\
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for example\
\
\
Presence document #1\
<person>\
activities sleeping\
source = tuple3\
\
Presence document #2\
<person>\
activities driving\
source = tuple1\
\
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One hopes that these two elements are contradictory\
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credibility of ambiguous person elements\
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}