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"Trees", "Recursion", "Searching" ] }, { "slug": "alphametics", "difficulty": 10, "topics": [ "Parsing", "Dictionaries" ] }, { "slug": "forth", "difficulty": 10, "topics": [ "Parsing", "Stacks" ] }, { "slug": "pov", "difficulty": 10, "topics": [ "Graphs", "Recursion", "Searching" ] } ], "deprecated": [ "binary", "trinary", "octal", "hexadecimal" ], "foregone": [ "lens-person", "nucleotide-codons", "paasio", "point-mutations", "counter" ] }