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DP159RSBEVM: R1-R4, R6-R9 design purpose and how to use it

Part Number: DP159RSBEVM

My customer is evaluating our DP159RSBEVM. Could you please kindly advice the purpose of R1-4 and R6-9 ?
If customer use source side == HDMI, How to handle this section?  I guess Page#6 show it but I am not sure detail.
Thanks for your support.