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REG:DIFFERENTIAL PAIR CONSTRAINT SETTING

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 I have some 20 pairs of 100E differential  signals .I have created  each diff-pair group by Object create->Differential Pair .

 How can I set the 2W spacing constraint between diffpairs .There is no option in Net class-class section for diff pair group   .
I can add separate net classes for each diffpair , but it will be cumbersome when the diffpair count is more !!
 
Please let me know is there any other option to set 2W spacing between diifpair.
Attached screen shot for more clarity
 

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