A *set* is a structure ** A** = (

Let ** A** and

Classtype | variety |

Equational theory | decidable |

Quasiequational theory | decidable |

First-order theory | decidable |

Locally finite | yes |

Residual size | 2 |

Congruence distributive | no |

Congruence modular | no |

Congruence n-permutable | no |

Congruence regular | no |

Congruence uniform | no |

Congruence extension property | yes |

Definable principal congruences | yes |

Equationally definable principal congruences | no |

Amalgamation property | yes |

Strong amalgamation property | yes |

Epimorphisms are surjective | yes |