where that just says "make an arbitrarily long list of 1's and reduce them using concatenation (the ~ operator), returning partial results in a list".
I personally believe that I need some clarifications: I understand clearly that the backslash implements the "returning partial results" thingie, but I am not sure about is semantics. In particular, is it a metaoperator modifying any binary operator, and if so, how? Or is really [\ ] a distinct metaoperator wrt [ ], with the former being the "reduction returning partial results" and the latter simply "reduction?"
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