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References to 'congruence'
1. angle by CWoo
2. characteristic monoid by CWoo
3. correspondence of normal subgroups and group congruences by Dr_Absentius
4. Hecke algebra by olivierfouquetx
5. Myhill-Nerode theorem for semigroups by Ziosilvio
6. Nerode equivalence by Ziosilvio
7. quotient group by azdbacks4234
8. Rees factor by mclase
9. Sch\"{u}tzenberger graph by Mazzu
10. semilattice decomposition of a semigroup by mclase
11. SSA by mathcam
12. syntactic congruence by Ziosilvio
13. Wagner congruence by Mazzu
14. word problem by Mazzu