What the heck are alists and plists exactly, how do we manipulate data structures ? It seems tedious sometimes, are there helpers ?Best read in the Cookbook.We hope to give here a clear reference of the common data structures. To really learn the language, you should take the time to read other resources. The following ones, which we relied upon, have many more details: Practical CL, by Peter Seibel CL Recipes, by E.