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edited Jul 17, 2018 at 16:06

You may Flatten the list and then take a RandomSample before partitioning to the original dimensions with Length and TakeList.

With keys the list in the OP then

TakeList[RandomSample[Flatten@keys,TakeList[RandomSample All]@ Flatten @ keys, Length /@ keys]

Hope this helps.

You may Flatten the list and then take a RandomSample before partitioning to the original dimensions with Length and TakeList.

With keys the list in the OP then

TakeList[RandomSample[Flatten@keys, All], Length /@ keys]

Hope this helps.

You may Flatten the list and then take a RandomSample before partitioning to the original dimensions with Length and TakeList.

With keys the list in the OP then

TakeList[RandomSample @ Flatten @ keys, Length /@ keys]

Hope this helps.

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created Jun 29, 2018 at 0:33

You may Flatten the list and then take a RandomSample before partitioning to the original dimensions with Length and TakeList.

With keys the list in the OP then

TakeList[RandomSample[Flatten@keys, All], Length /@ keys]

Hope this helps.