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Here is how to identify the unmarked lines.
Use a jumper wire to short out the coax at the end in the rooms. Go to the other end where the eight way splitter is located. disconnect all lines from the splitter. Use a volt/ohm meter ( buy a cheap one or borrow one if possible) to check for a short circuit on the coax at the splitter.
Mark the coax that registers the short circuit to identify the location.
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