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References to '$\Diamond$'
1. diamond lemma by CWoo
2. ETAS interpretation by bci1
3. index of set theory by rspuzio
4. poker by PrimeFan
5. pseudocomplement by CWoo
6. Sloane's conjecture on multiplicative digital root by CompositeFan
7. supercategory by bci1
8. supercategory theories by bci1