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Coeus is an esolang inspired (loosely) by 3-cell brainf*ck. It uses 4 registers (A-D). A is initially 1 and all others are 0.


X and Y represent any register.

Command Meaning
aX Print value stored in X
bX Multiply A and X, store result in A
cX Set X to 1/X
dX Increment X
eX Decrement X
fX Swap A and X
gX Set X to n, where A = kXn and X doesn't divide k
hX Set X to input
[XY][m][n] Program m is ran independently of the main program. After m halts, set V = register Y. While register X from the main program doesn't equal V, run n.

Example Programs

Truth Machine:




Infinite Counter: (starts from 0)