268( i )

E] b E E{ {ʙ | { |

En t BxM H iʮ | +{ |

xɟnn E ʤb

xz {^nhM ʳ {nʴ Eb

< HVxɮ Bz ʮ

< ʟ xz nɺ nɺ xxɺ | 1 |

=^ =b ʨDn BxM E

{^Mx ə =cɟ E

P]M D i{{ ^ =hɺ

n ^ ɽ VxMə BxM ʤb | 2 |

E^M^n EΤhD {] E

=iE Mɮn Bz ʮ

^M =M֮ b E

ʨ n^ {֮nʴ`x nn {ʙ | 3 |