I believe the book's qualms about calling that a solution involve the possibility of a combinatorial explosion if the language forces you do define all possible pairings, and the opacity and artificial stupidity of the solution if the computer is attempting to use artificial intelligence to second-guess the programmer's ideas of what should be intuited when types are not arrangeable in a simple "tower".
Of course, this does not stop us from trying to solve the problem anyway... :)
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