1. A kit representing characters of a known set, the characters representable in an upper case and in a lower case, the kit comprising: a first plurality of pieces representing the characters of the known set in the upper case, the first plurality of pieces each having a cut-out section wherein the cut-out section represents a corresponding one of the characters of the known set in the lower case; and a second plurality of pieces representing the characters of the known set in the lower case wherein each one of the second plurality of pieces of the lower case is insertable into the cut-out section of a corresponding one of the first plurality of pieces in the upper case.
7. The kit of claim 1 wherein the first plurality of pieces includes at least twenty-six pieces.