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The five zone model were devided into two groups, in group a, if use boost on one
zone, first make sure that the other zone is working on/below power level 5.
Another situation is it can set boost function for both zone in the same group when
this group is in flex function mode.In group b, you can only use Boost function for
one zone at a time. If you try to use the Boost for two zones at the same time, the
first zone which use Boost function will drop out of boost function.
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