| http://www.w3.org/ns/prov#value | - One solution to this problem is the so-called picture in picture system in which a television has two tuners and a memory, the second programme being shown in a window within the first programme; the patent (see column 1, lines 20 to 31) describes such a system as rather expensive in view of the extra hardware required and disturbing the viewing of the main programme because of the presence of t
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