Pity that eval is forbidden - I had quite an elegant solution using it.
Sums with Excluded Digits
Remove white space from the string
Make a logical diamond using GALLERY function
Create an n-by-n null matrix and fill with ones certain positions
Create a random logical vector of N elements of which M are true.
Order of things - 2
Convert a substructure reference string into a valid definition structure for subsref and subsasgn
Insert certain elements into a vector.
Bleed non-zeros to the right using REGEXP, and that sort of cheatcodess...
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