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parsing
Parsing or syntactic analysis is the process of analysing a string of symbols, either in natural language or in computer languages, conforming to the rules of a formal grammar.
cons cells
Cons cells are immutable: When you create a cons cell, its two fields are initialized and will never change. (This is a major difference between Racket and Scheme.) Hence we can continue to enjoy the benefits of knowing that cons cells cannot be mutated by other code in our program.
improper list
Pairs (cons cells) in Erlang are written as [Head|Tail] and nil is written as []. There is no restriction as to what the head and tail are but if you use the tail to chain more cons cells you get alist. If the final tail is [] then you get a proper list.
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