How to select one gene at a CpG site?

Hello, I have some problem to process TCGA public data.

I downloaded TCGA breast cancer's methylation data with annotation information using "TCGAbiolinks" package of R but there are some CpG sites which have multiple gene symbols at each.

However, I need data which have 1 gene symbol at 1 CpG site for analysis.

Is there any criteria or method?

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gene


assembly

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