If it's a true "Bell System" loop of prewire, both ends of the cable will come out to the protector or network interface. Theoretically, this loop was run uncut through every outlet in the house. If that's the case, you could cut the loop in the kitchen, yielding you two separate 3-pair cables. One could be used for each line appearance.
You'd need to go to every other outlet and make sure that none of the pairs are cut, or if they are, you'd need to splice them back together.
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