# The Four Elopements : Solution

The feat can be performed in 17 trips. We begin with ABCD (the men) and abcd (the girls) all on shore. The following chart is self-explanatory. |

Shore | Island | Other side | |

1 | A B C D c d | a b | |

2 | A B C D b c d | a | |

3 | A B C D d | b c | a |

4 | A B C D c d | b | a |

5 | C D c d | b | A B a |

6 | B C D c d | b | A a |

7 | B C D | b c d | A a |

8 | B C D d | b c | A a |

9 | D d | b c | A B C a |

10 | D d | a b c | A B C |

11 | D d | b | A B C a c |

12 | B D d | b | A C a c |

13 | d | b | A B C D a c |

14 | d | b c | A B C D a |

15 | d | A B C D a b c | |

16 | c d | A B C D a b | |

17 | A B C D a b c d |

Note: There are other ways the puzzle can be solved in 17 trips. This solution
is the most satisfactory in that it involves the fewest "gettings in" and "gettings out". |