yes ,you are right ,you answer should have been marked correct !!!
FG1 must contain T1, T2, CI1 and CI2,
and that FG2 must contain T3, T4, CI3 and CI4.
FG1 must contain T1, CI1, T3 and CI3,
and that FG2 must contain T2, CI2, T4 and CI4.
In fact ,Both of them are the same ,and the only difference is that there is a exchange of 2 and 3,which is ok .
So ,in my opinion ,you are right .
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