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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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Current File : //proc/self/root/usr/share/graphviz/gvpr/addranks

/* Assuming nodes have been positioned by dot, this adds a rank
 * attribute by placing all nodes with the same y value on a specific
 * integer rank.
 * If the graph has rankdir=LR, x and y are flipped.
 */
BEG_G {
  double x,y;
  int lv[double];
  int r, rk[double];
  int flip;
  if (isAttr($,"G","rankdir") && $.rankdir=="LR") flip = 1;
}
N {
  sscanf($.pos,"%f,%f",&x,&y);
  if (flip) lv[x] = 1;
  else lv[y] = 1;
}
BEG_G {
  r = 0;
  if (flip)
    forr (lv[x]) {
      rk[x] = r++;
      /* printf (2, "rk[%f] = %d\n", y, rk[y]); */
    }
  else
    forr (lv[y]) {
      rk[y] = r++;
      /* printf (2, "rk[%f] = %d\n", y, rk[y]); */
    }
}
N {
  sscanf($.pos,"%f,%f",&x,&y);
  /* printf(2, "node %s y %f rk %d\n", $.name, y, rk[y]); */
  if (flip) $.rank = sprintf("%d", rk[x]); 
  else $.rank = sprintf("%d", rk[y]); 
}

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