Fill up the 5 container and dump it all in the 3 to get 3 in the 3, 2 in the 5 and 3 in the 8. Dump all the 3 in the 8 and dump the two from the five in the 3 to get 2 in the 3, none in the 5, and 6 outside. Fill up the 5 and dump one in the 3. You get 3 in the three and 4 in the 5. Put the three with the remaining one in the 8 jar and yu have two separate piles of four!