<http://webisa.webdatacommons.org/164188036>	<http://www.w3.org/ns/prov#value>	"FIG. 7 is a time chart explaining the operation of the terminal devices of the communication system according to the embodiment of the present invention." .
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<http://webisa.webdatacommons.org/164188036>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .