68 c

Bn EƤx Bz ə in =b{ɪ Vhx

nɺ |ɴhx <n ڮhx | { |

Ebnbn B Mx EbMxhx {bnx

b{֮nbx < bMɳʙ ʶɮʴbx | 1 |

nE V`nʙ nx +ɴ{ɲʙ xnx ɴ

Ex Enx Eɨxɪx Enx | 2 |

{ڭh|YʮMʙn uɮE hhx |E]ʺnx

ɴɭhɴE |ɴxnx |ɺzɴE]Ehx | 3 |