- Magic wand - fuzzy select/delete leaving fuzzy selected borders https://en.m.wikibooks.org/wiki/GIMP/Removal_of_Unwanted_Elements_in_the_Image#Method_1:_Magic_Wand 4 comments gimp
- Membership of a type in a class hierarchy https://en.m.wikibooks.org/wiki/Ada_Programming/Object_Orientation#Run-time_type_identification 6 comments ada
- Memoization in Haskell https://en.m.wikibooks.org/wiki/Haskell/Fix_and_recursion 32 comments haskell
- An awk primer https://en.m.wikibooks.org/wiki/an_awk_primer 27 comments linux