point 0 |

point 50 | point 100 | point 150 |

point 0 |

point 50 | point 100 | point 150 |

point 0 |

point 50 | point 100 | point 150 |

point 0 |

point 50 | point 100 | 1

point 100 |

point 150 |

point 0 |

point 50 | point 100 | point 150 |

point 0 |

point 50 | point 100 | point 150 |

point 0 |

point 50 | point 100 | 1

point 100 |

point 150 |

point 0 |

point 50 | point 100 | point 150 |

point 0 |

point 50 | point 100 | 1

 

??????????????????