how to write for setUp inject portion in case have 4 main accounts and would like for each account try to login 2 times.

Gatling (Open-Source)
1

userid.csv
UserID , Group
abc1,2
abc2,3
abc3,4
abc4,5

setUp(scn.inject(rampUsers(4) over (10 seconds))).protocols(httpProtocol)

2

I try like

userid.csv
UserID , Group
abc1,2
abc2,3
abc3,4
abc4,5

abc1,2
abc2,3
abc3,4
abc4,5

setUp(scn.inject(rampUsers(8) over (10 seconds))).protocols(httpProtocol)

and result seem ok , not any error ,
Anyone have better way than this way , Please kindly recommend .