this post was submitted on 11 Feb 2024
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TL;DR:
Grid<A,B,C,D,E,F,G,H>
simplifies to true, if and only if it is a 3x3 magic square.full explanation
Fifteen
is an array of length 15T<A,B,C>
checks if an array of lengthA
+B
+C
is equivalent to an array of length 15, thus checking ifA
+B
+C
is equal to 15And<A,X>
is simplifies toX
ifA
is true, else it simplifies tofalse
Df<A,B,X>
checks ifA
andB
are Diffrent , simplifying toX
if they areGrid<A,B,C,D,E,F,G,H>
first checks if every row, column and diagonal is equal to 15, then checks if every item is unique.