Currently I have
4 - (X % (Y % (X - 4)))
It looks like I can have a simpler term than this.
I just need last 4 rows to have 4, 3, 2, 1
Not sure whether there is a simpler equation!
2026-04-02 10:06:04.1775124364
How to simplify modulus expression?
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$$Y\bmod (X-4)=X-k,k>4$$ Which means:$$X\bmod(Y\bmod(X-4))\equiv X-(X-k)\equiv k, \quad\text{if}\quad k\leq\frac{X}{2}$$
Which means half the time your value is $4-k$
The real problem, is dealing with finding k and working the other half of the time. Without a general use of variables, There's less chance that it can be put as something simpler in all cases.