After figuring how to plant your 10 trees in 5 rows, the tree keeper walks up to you.
I like your idea, but sometimes I get vicious squirrels that come and steal all the fruit off it...
I am installing some garden path such that it is harmless to humans but will shock squirrels. (This means the squirrels won't pass over it.) Can you place those 10 trees along 5 lines of straight garden path so that there are 4 trees on each garden path and there are some trees on the inside?
How would you arrange the trees this time?