Plates of biscuits are put out for Sports Day snacks. There are 12 plates with 3 identical biscuits on each plate.

(They are named simply to help identify them by a letter!)
Can you rearrange the biscuits on the plates so that
For example, if you have one plate of `A, D and F' then you cannot have another with both `A and D' or `A and F' or `D and F'.