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Basics ph-core offers a standard data type, Phase::NArray that will suffice for most of your multidimensional data storage and manipulation needs. However, storing information linearly in memory isn’t always the most effective appraoch, and sometimes isn’t possible. Phase::MultiIndexable is an interface defining a common set of rules we expect any multidimensional array to obey; and by implementing this interface, you can treat your own type almost like an NArray. Let’s say we want to be able to access any 5-digit number, using each place value as a coordinate....