Different sets of whistles to use on sheepdogs

why do we work sheepdogs on different sets of verbal commands or different sets of whistles?
The only reason i put different commands or whistles on my dogs is so that i can work them together doing a sheep job. the different whistles mean that i can control each dog separately
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the different whistles that i use on my working sheepdogs, are the ones i use for their sides (their left and right hand)

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• #sheepdog_commands
• #sheepdog_whistles
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