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<urn:Alice> <urn:talksTo> <urn:Bob>.
<urn:Bob> <urn:talksTo> <urn:Alice>.
<urn:Bob> <urn:talksTo> <urn:Charlie>.
<urn:Charlie> <urn:talksTo> <urn:Alice>.
<urn:David> <urn:talksTo> <urn:Eve>.
<urn:Eve> <urn:listensTo> <urn:Bob>.