feedback object - correct answer one of many

[Yan Yu]

Dear E-primers,

I need your expertise on my experiment.
I need to present 8 pictures on one screen to let the participants to
choose four from the eight, then present them with correct choices
once they finish picking the all four pictures. Accuracy can only be
counted if all four pictures are correct.  I have a total of 100 sets
of pictures to present without any repetition.

Could any of you give me some idea how to handle it?

Thanks a lot!

Yan from New York

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