As stated above, the Master and User Devices 220, 222, 224 may be {HEAD ~ any number} of {TAIL ~ electronic devices} including, but not limited to, PDAs, mobile telephones, mobile PCs or desktop units, televisions, amulets, or other pure input/output devices 
of
As stated above , the Master and User Devices 220 , 222 , 224 may be { HEAD ~ any number } of { TAIL ~ electronic devices } including , but not limited to , PDAs , mobile telephones , mobile PCs or desktop units , televisions , amulets , or other pure input / output devices
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