**problems A — find modulus**

For a modulus problem *a* ~ *b* ~ *c* to have a unique solution, one of the following conditions must be true:

*a*<*b*and*b*>*c**a*>*b*and*b*<*c*

A-1: | 3 ~ | 8 ~ | 0 |

A-2: | 3 ~ | 8 ~ | 1 |

A-3: | 3 ~ | 8 ~ | 2 |

A-4: | 3 ~ | 8 ~ | 3 |

A-5: | 3 ~ | 8 ~ | 4 |

A-6: | 8 ~ | 3 ~ | 11 |

A-7: | 8 ~ | 3 ~ | 10 |

A-8: | 8 ~ | 3 ~ | 9 |

A-9: | 8 ~ | 3 ~ | 8 |

A-10: | 8 ~ | 3 ~ | 7 |