Some tricky pointer arithmetic.

Turns out a really easy optimization if order doesn't matter much is to treat it like a single dimentional array of length *d1 x d2 x d3 ... dn* where d1 is the first dimention, etc. These two expressions are exactly equivalent in the way the memory is laid out, for instance:

```
int a[2][2] = {{1,2},{3,4}};
int a[4] = {1,2,3,4};
```

In C:

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