prov:value
| - The accessor devices A1, . . . , AN could be any type of human interface device, for either input from a user or output to a user, such as a keyboard, a mouse, a video monitor, a liquid-crystal display, an LED display, a speaker, a voice synthesizer, a speech recognition system, a remote control, a headband switch, an eye tracker, a printer, a personal data assistant, a sound generator, a Braille
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