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Re:Cons is your friend by enupten on Thursday September 11, 2014 @06:19PM (#8305519)
I know jargon looks unsurmountable at first, but if you pay close attention to definitions, they are usually extremely simple. To wit, the example you quote is just the set of strings on X.
Re:Cons is your friend by nice_uname_nerd on Thursday September 11, 2014 @07:24PM (#8305790)
It's more than just strings though, it's all lists on a set of atoms. (a b c) is treated differently from (a (b c)).

EDIT: Actually you're right, it's all strings on X. I thought the author wanted all lists on X.