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Trace: • finite_commutative_semigroups • abelian_lattice-ordered_groups • commutative_inverse_semigroups • complete_distributive_lattices • involutive_residuated_lattices • monoidal_t-norm_logic_algebras • commutative_rings_with_identity • definable_principal_congruences • finite_integral_ordered_monoids • lukasiewicz_algebras_of_order_n