“Like learning to ride a bicycle” should be the standard for a well structured learnable skill. So many skills we work so hard to acquire are *not* like that.
All symbol-mediated ones and most powered subsymbolic ones (like driving) are not LLTRAB.
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Where would learning a new natural language fall in your scheme?
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40% LLTRAB
My Hindi vocabulary has atrophied atrociously since moving to the US but I don’t think it will ever degrade to the point of illiteracy no matter how little I use it

