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Hello world, I just now realized that our rule: {e} -> e Means that in practice, {} is "just for grouping", the way () in other languages is used for grouping. So, nested {} around single forms doesn't change the iconic meaning of the underlying data structures. Consider the C: ((a) + (b)) and the Scheme+SRFI-105: {{a} + {b}} ==> (+ a b) I'll probably add that to the rationale soon. Sincerely, AmkG