That s all there is to it. J has helped to give a solution significantly shorter than the APL solution. All of these are scalars. I measured the time needed to produce solutions for each of these representations using two different cube sets, one which had only one solution, and one which had 22 solutions. The table shows that the symbol datatype is competitive in time with the single character and integer data types, which is what we hoped would happen.
Symbols are a much more efficient datatype to work with than are boxed names.
It also shows, which should not be a surprise to anyone, that I have on my desk a computer that is seventy times faster and has much larger memory and disk storage than did the large roomful of computer and disk packs that had seemed so very powerful twenty years ago.